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In algebraic combinatorics, the h-vector of a simplicial polytope is a fundamental invariant of the polytope which encodes the number of faces of different
H-vector
Vector-H (Vector Heavy) was a planned two-stage or three-stage orbital expendable launch vehicle in development by the American aerospace company Vector
Vector-H
Measure of directional electromagnetic energy flux
where bold letters represent vectors and E is the electric field vector; H is the magnetic field's auxiliary field vector or magnetizing field. This expression
Poynting_vector
Property of space that quantifies the magnetic influence at a given location
characterized by the magnetic field strength vector H and the magnetic flux density vector B." This standard also defines B and H as given in the sections below. While
Magnetic_field
Sports car produced from 1990 to 1993, based on the Vector W2
The Vector W8 is a sports car produced by American automobile manufacturer Vector Aeromotive Corporation from 1989 to 1993. It was designed by company
Vector_W8
Type of mathematical set
h_{2}x^{d-1}+\cdots +h_{d}x+h_{d+1}} and the h-vector of Δ is ( h 0 , h 1 , h 2 , ⋯ , h d + 1 ) . {\displaystyle (h_{0},h_{1},h_{2},\cdots ,h_{d+1})
Simplicial_complex
Vector of length one
In mathematics, a unit vector in a normed vector space is a vector (often a spatial vector) of length 1. A unit vector is often denoted by a lowercase
Unit_vector
Broad concept generalizing scalars in mathematics and physics
In mathematics and physics, a vector is a generalization of a single number. It may denote a vector quantity, i.e., physical quantity that cannot be expressed
Vector (mathematics and physics)
Vector_(mathematics_and_physics)
Vector space with generalized dot product
space is a real or complex vector space endowed with an operation called an inner product. The inner product of two vectors in the space is a scalar, often
Inner_product_space
Algebraic structure in linear algebra
operations of vector addition and scalar multiplication must satisfy certain requirements, called vector axioms. Real vector spaces and complex vector spaces
Vector_space
Geometric object that has length and direction
physics, and engineering, a Euclidean vector or simply a vector (sometimes called a geometric vector or spatial vector) is a geometric object that has magnitude
Euclidean_vector
Mid-engine sports car produced by Vector Aeromotive as a successor to the W8
The Vector M12 is a sports car manufactured by Vector Aeromotive under parent company Megatech, and was the first car produced after the hostile takeover
Vector_M12
Circulation density in a vector field
In vector calculus, the curl, also known as rotor, is a vector operator that describes the infinitesimal circulation of a vector field in three-dimensional
Curl_(mathematics)
Set of methods for supervised statistical learning
In machine learning, support vector machines (SVMs, also support vector networks) are supervised max-margin models with associated learning algorithms
Support_vector_machine
Use of coordinates for representing vectors
Vector notation In mathematics and physics, vector notation is a commonly used notation for representing vectors, which may be Euclidean vectors, or more
Vector_notation
Combinitorics of Polyhedra
convenient to transform these vectors, producing a different vector called the h-vector. If we interpret the terms of the ƒ-vector (omitting the final 1) as
Polyhedral_combinatorics
Vector differential operator
or nabla, is an operator used in mathematics (particularly in vector calculus) as a vector differential operator, usually represented by ∇ (the nabla symbol)
Del
Machine learning technique
each input word into a vector by a fixed lookup table. This gives a sequence of hidden vectors h 0 , h 1 , … {\displaystyle h_{0},h_{1},\dots } . These can
Attention_(machine_learning)
Vector representing lattice distortion due to dislocations in a crystal
In materials science, the Burgers vector, named after Dutch physicist Jan Burgers, is a vector, often denoted as b, that represents the magnitude and direction
Burgers_vector
Length in a vector space
In mathematics, a norm is a function from a real or complex vector space to the non-negative real numbers that behaves in certain ways like the distance
Norm_(mathematics)
Calculus of vector-valued functions
Vector calculus or vector analysis is a branch of mathematics concerned with the differentiation and integration of vector fields, primarily in three-dimensional
Vector_calculus
Algebraic operation on coordinate vectors
numbers (usually coordinate vectors), and returns a single number. In Euclidean geometry, the scalar product of two vectors is the dot product of their
Dot_product
Vector used in astronomy
In classical mechanics, the Laplace–Runge–Lenz vector (LRL vector) is a vector used chiefly to describe the shape and orientation of the orbit of one
Laplace–Runge–Lenz_vector
Vector field on a pseudo-Riemannian manifold that preserves the metric tensor
mathematics and theoretical physics, a Killing vector field or Killing field (named after Wilhelm Killing) is a vector field on a Riemannian manifold or pseudo-Riemannian
Killing_vector_field
Multivariate derivative (mathematics)
In vector calculus, the gradient of a scalar-valued differentiable function f {\displaystyle f} of several variables is the vector field (or vector-valued
Gradient
Mathematical operation on vector spaces
{\displaystyle V\otimes W} of two vector spaces V {\displaystyle V} and W {\displaystyle W} (over the same field) is a vector space to which is associated
Tensor_product
Notation for quantum states
mathematical notation for linear algebra and linear operators on complex vector spaces together with their dual spaces both in the finite- and infinite-dimensional
Bra–ket_notation
Vector space with a notion of nearness
A topological vector space is a vector space that is also a topological space with the property that the vector space operations (vector addition and scalar
Topological_vector_space
Set of vectors used to define coordinates
In mathematics, a set B of elements of a vector space V is called a basis (pl.: bases) if every element of V can be written in a unique way as a finite
Basis_(linear_algebra)
sequence h ( P ) = ( h 0 , h 1 , … , h d ) {\displaystyle h(P)=(h_{0},h_{1},\ldots ,h_{d})} is called the h-vector of P. The f-vector and the h-vector uniquely
Dehn–Sommerville_equations
Assignment of a vector to each point in a subset of Euclidean space
In vector calculus and physics, a vector field is an assignment of a vector to each point in a space, most commonly Euclidean space R n {\displaystyle
Vector_field
Function valued in a vector space; typically a real or complex one
of multidimensional vectors or infinite-dimensional vectors. The input of a vector-valued function could be a scalar or a vector (that is, the dimension
Vector-valued_function
Four-dimensional number system
parallel vector parts): the notation p/q is ambiguous and should not be used. The set H {\displaystyle \mathbb {H} } of all quaternions is a vector space
Quaternion
Hilbert space H has a cyclic vector f if the vectors f, Af, A2f,... span H. Equivalently, f is a cyclic vector for A in case the set of all vectors of the form
Cyclic_vector
Computer graphics images defined by points, lines and curves
Vector graphics are a form of computer graphics in which visual images are created directly from geometric shapes defined on a Cartesian plane, such as
Vector_graphics
Vector in relativity
In special relativity, a four-vector (or 4-vector, sometimes Lorentz vector) is an element of a four-dimensional vector space object with four components
Four-vector
Differential operator used in vector calculus
A vector operator is a differential operator used in vector calculus. Vector operators include: Gradient is a vector operator that operates on a scalar
Vector_operator
Mathematical parametrization of vector spaces by another space
In mathematics, a vector bundle is a topological construction that makes precise the idea of a family of vector spaces parameterized by another space
Vector_bundle
Concept car created by Vector Motors in 1980
The Vector W2 is a concept car constructed by Vector Motors in 1978. The concept went into production as the Vector W8 in 1990. The name comes from the
Vector_W2
Boson with spin 1
name vector boson arises from quantum field theory. The component of such a particle's spin along any axis has the three eigenvalues −ħ, 0, and +ħ (where
Vector_boson
Vector in celestial mechanics
orbit) corresponds to a singularity. The eccentricity vector e {\displaystyle \mathbf {e} } is: e = v × h μ − r | r | = ( | v | 2 μ − 1 | r | ) r − r ⋅ v μ
Eccentricity_vector
Mathematical concept in vector calculus
In vector calculus, a vector potential is a vector field whose curl is a given vector field. This is analogous to a scalar potential, which is a scalar
Vector_potential
Vector describing a wave; often its propagation direction
In physics, a wave vector (or wavevector) is a vector used in describing a wave, with a typical unit being cycle per metre. It has a magnitude and direction
Wave_vector
Certain vector fields are the sum of an irrotational and a solenoidal vector field
theorem of vector calculus states that certain differentiable vector fields can be resolved into the sum of an irrotational (curl-free) vector field and
Helmholtz_decomposition
Mathematical operation in linear algebra
represented by capital letters in bold, e.g. A; vectors in lowercase bold, e.g. a; and entries of vectors and matrices are italic (they are numbers from
Matrix_multiplication
Mathematical operation on vectors in 3D space
product or vector product (occasionally directed area product, to emphasize its geometric significance) is a binary operation on two vectors in a three-dimensional
Cross_product
Vector field that is the gradient of some function
In vector calculus, a conservative vector field is a vector field that is the gradient of some function. A conservative vector field has the property
Conservative_vector_field
toric h-vector of a ranked poset, which generalizes the h-vector of a simplicial polytope. He proved that the Dehn–Sommerville equations h k = h d − k
Eulerian_poset
Vector on which a quadratic form is zero
In mathematics, given a vector space X with an associated quadratic form q, written (X, q), a null vector or isotropic vector is a non-zero element x
Null_vector
Agent that carries and transmits pathogens
In epidemiology, a disease vector is any living agent that carries and transmits an infectious pathogen such as a parasite or microbe, to another living
Disease_vector
Mathematical object used in fluid dynamics
Lamb vector is the cross product of vorticity vector and velocity vector of the flow field, named after the physicist Horace Lamb. The Lamb vector is defined
Lamb_vector
Direction and rate of rotation
letter omega), also known as the angular frequency vector, is a three-dimensional Euclidean vector that uniquely identifies the plane, direction and angular
Angular_velocity
Location of a discrete degeneracy between two electronic states
and h vectors orthogonal is usually chosen. This choice is unique up to the signs and switchings of the two vectors, and allows these two vectors to have
Conical_intersection
Theorem in vector calculus
theorem in vector calculus on three-dimensional Euclidean space and real coordinate space, R 3 {\displaystyle \mathbb {R} ^{3}} . Given a vector field, the
Stokes'_theorem
Electric motorcycle
Arc Vector is an electric motorcycle made by British motorcycle manufacturer Arc Vehicles from 2017 to 2019 and by the company's successor Arc V from 2022
Arc_Vector
Relation of an integral polytope's volume to how many integer points it encloses
contained in Q, then h j ∗ ( P ) ≤ h j ∗ ( Q ) {\displaystyle h_{j}^{*}(P)\leq h_{j}^{*}(Q)} for all j. The h ∗ {\displaystyle h^{*}} -vector is in general not
Ehrhart_polynomial
Concept in statistics
matrix or hat matrix ( H ) {\displaystyle (\mathbf {H} )} , maps the vector of response values (dependent variable values) to the vector of fitted values (or
Projection_matrix
German technology company
order, August 2022, 33 VECTOR Second order, January 2023, 105 VECTOR Third order, May 2023, 300 VECTOR Deliveries: 619 VECTOR supplied by Germany as of
Quantum-Systems
Concepts from linear algebra
algebra, an eigenvector (/ˈaɪɡən-/ EYE-gən-) or characteristic vector is a (nonzero) vector that has its direction unchanged (or reversed) by a given linear
Eigenvalues_and_eigenvectors
Cartesian vectors of position and velocity of an orbiting body in space
and celestial dynamics, the orbital state vectors (sometimes state vectors) of an orbit are Cartesian vectors of position ( r {\displaystyle \mathbf {r}
Orbital_state_vectors
German software company
sold. In 1998, Vector CANtech (USA) was founded, and in the following year Vector Japan. In 2001, the subsidiary Vector Consulting GmbH was founded, which
Vector_Informatik
SQL relational database management system
Actian Vector (formerly known as VectorWise) is an SQL relational database management system designed for high performance in analytical database applications
Actian_Vector
Generalization of boundedness
mathematics, a set in a topological vector space is called bounded or von Neumann bounded, if every neighborhood of the zero vector can be inflated to include
Bounded set (topological vector space)
Bounded_set_(topological_vector_space)
In applied mathematics and dynamical system theory, Lyapunov vectors, named after Aleksandr Lyapunov, describe characteristic expanding and contracting
Lyapunov_vector
Defunct launch vehicle designer and launch service provider
Vector Launch, Inc. (formerly Vector Space Systems) was an American space technology company which aims to launch suborbital and orbital payloads. Vector
Vector_Launch
Similarity measure for number sequences
between two non-zero vectors defined in an inner product space. Cosine similarity is the cosine of the angle between the vectors; that is, it is the dot
Cosine_similarity
Memory unit used in neural networks
vector is h 0 = 0 {\displaystyle h_{0}=0} . z t = σ ( W z x t + U z h t − 1 + b z ) r t = σ ( W r x t + U r h t − 1 + b r ) h ^ t = ϕ ( W h x t + U h
Gated_recurrent_unit
Computational approach
of elements in H as function ⊕ : H ×H → H. The input is two points in H and the output is a third point that is similar to both. Vector symbolic architectures
Hyperdimensional_computing
Vector quantity in celestial mechanics
position vector r {\displaystyle \mathbf {r} } and the relative velocity vector v {\displaystyle \mathbf {v} } . h = r × v = L m {\displaystyle \mathbf {h} =\mathbf
Specific_angular_momentum
American automobile manufacturer
Vector Motors Corporation was an American automobile manufacturer originally based in Wilmington, California. Its history can be traced to Vehicle Design
Vector_Motors
entropic vector is submodular: 3 ) H ( X I ) + H ( X J ) ≥ H ( X I ∪ J ) + H ( X I ∩ J ) {\displaystyle 3)\quad H(X_{I})+H(X_{J})\geq H(X_{I\cup J})+H(X_{I\cap
Entropic_vector
Mathematical concept applicable to physics
in applied mathematics and vector calculus which has many applications in physics. For transport phenomena, flux is a vector quantity, describing the magnitude
Flux
Normed vector space that is complete
normed vector space. Thus, a Banach space is a vector space with a metric that allows the computation of vector length and distance between vectors and is
Banach_space
Polynomial sequence
_{k=0}^{n}A(n,k)\,x^{k}} implies that the Eulerian numbers form the h ∗ {\displaystyle h^{\ast }} -vector of the standard n {\displaystyle n} -dimensional hypercube
Eulerian_number
Vector operator in vector calculus
In vector calculus, divergence is a vector operator that operates on a vector field, producing a scalar field giving the rate that the vector field alters
Divergence
Frame of reference for an orbit
\mathbf {\hat {w}} } is the unit vector in the direction of the angular momentum vector, it may also be expressed as: w ^ = h ‖ h ‖ {\displaystyle \mathbf {\hat
Perifocal_coordinate_system
Complex vector bundle on a complex manifold
In mathematics, a holomorphic vector bundle is a complex vector bundle over a complex manifold X such that the total space E is a complex manifold and
Holomorphic_vector_bundle
Mathematical description of spacetime used in relativity
n ) ∈ H R n , {\displaystyle P=\left(\tau ,x^{1},\ldots ,x^{n}\right)\in \mathbf {H} _{R}^{n},} then it is geometrically clear that the vector P S → {\displaystyle
Minkowski_spacetime
Coordinate system whose directions vary in space
orthonormal basis vectors by b 1 = h 1 h 1 ; b 2 = h 2 h 2 ; b 3 = h 3 h 3 . {\displaystyle \mathbf {b} _{1}={\dfrac {\mathbf {h} _{1}}{h_{1}}};\;\mathbf
Curvilinear_coordinates
American direct selling company
Vector Marketing is a direct selling subsidiary company and the marketing arm of Cutco Corporation, an Olean, New York–based cutlery manufacturer. The
Vector_Marketing
Differential operator in mathematics
the vector Laplacian applies to a vector field, returning a vector quantity. When computed in orthonormal Cartesian coordinates, the returned vector field
Laplace_operator
Quantum-mechanical vector property in solid-state physics
quasimomentum is a momentum-like vector associated with electrons in a crystal lattice. It is defined by the associated wave vectors k {\displaystyle \mathbf
Crystal_momentum
Motor vehicle
car successor to their previous models. Vector claimed the WX-8 may achieve a top speed of 270 mph (430 km/h) and a zero-to-60 mph time as low as 2.3
Vector_WX-8
Mathematics concept
mathematics, the complex conjugate of a complex vector space V {\displaystyle V\,} is a complex vector space V ¯ {\displaystyle {\overline {V}}} that has
Complex conjugate of a vector space
Complex_conjugate_of_a_vector_space
Linear map from a vector space to its field of scalars
is a linear map from a vector space to its field of scalars (often, the real numbers or the complex numbers). If V is a vector space over a field k, the
Linear_form
Behaviour of electromagnetic fields
neighbourhood around the point to which they are applied, otherwise the vector fields and H are not differentiable. In other words, the medium must be continuous[no
Interface conditions for electromagnetic fields
Interface_conditions_for_electromagnetic_fields
In physics and mathematics, a symplectic vector field is one whose flow preserves a symplectic form. That is, if ( M , ω ) {\displaystyle (M,\omega )}
Symplectic_vector_field
Vector behavior under coordinate changes
Briefly, a contravariant vector is a list of numbers that transforms oppositely to a change of basis, and a covariant vector is a list of numbers that
Covariance and contravariance of vectors
Covariance_and_contravariance_of_vectors
Type of vector space in math
S of H. A subset S of H spans a dense vector subspace if (and only if) the vector 0 is the sole vector v ∈ H orthogonal to S. The dual space H* is the
Hilbert_space
On closed convex subsets in Hilbert space
for every vector x {\displaystyle x} in a Hilbert space H {\displaystyle H} and every nonempty closed convex C ⊆ H , {\displaystyle C\subseteq H,} there
Hilbert_projection_theorem
Type of wave
In physical optics or wave optics, a vector soliton is a solitary wave with multiple components coupled together that maintains its shape during propagation
Vector_soliton
Space with topology generated by convex sets
mathematics, locally convex topological vector spaces (LCTVS) or locally convex spaces are examples of topological vector spaces (TVS) that generalize normed
Locally convex topological vector space
Locally_convex_topological_vector_space
Two stage Launch vehicle, 60 kg payload to LEO
situation. An upgraded version of the Vector-R, called the Vector-H (Heavy), is in development as well. Vector-R plans to use two stages with a 1.2-meter
Vector-R
Mathematical identities
following are important identities involving derivatives and integrals in vector calculus. For a function f ( x , y , z ) {\displaystyle f(x,y,z)} in three-dimensional
Vector_calculus_identities
Classical quantization technique from signal processing
Vector quantization (VQ) is a classical quantization technique from signal processing that allows the modeling of probability density functions by the
Vector_quantization
Vector field defined for any energy function
Hamiltonian vector field with Hamiltonian H {\displaystyle H} takes the form: X H = ( ∂ H ∂ p i , − ∂ H ∂ q i ) = Ω d H , {\displaystyle \mathrm {X} _{H}=\left({\frac
Hamiltonian_vector_field
Euclidean space without distance and angles
point, the zero vector is called the origin. Adding a fixed vector to the elements of a linear subspace (vector subspace) of a vector space produces an
Affine_space
Algebra associated to any vector space
In mathematics, the exterior algebra or Grassmann algebra of a vector space V {\displaystyle V} is an associative algebra that contains V , {\displaystyle
Exterior_algebra
mechanics, the n-vector model or O(n) model is a simple system of interacting spins on a crystalline lattice. It was developed by H. Eugene Stanley as
N-vector_model
and their notations. Note that bold text indicates that the quantity is a vector. List of letters used in mathematics and science Glossary of mathematical
List of common physics notations
List_of_common_physics_notations
H VECTOR
H VECTOR
Boy/Male
Muslim
Selflessness, Eminent, {m}fascinating, {h}lord Shiva
Boy/Male
Tamil
{h}name of Ganesh, {m}fire
Surname or Lastname
Variant spelling of Norwegian Høgset(h) (see Hogsett).English
Variant spelling of Norwegian Høgset(h) (see Hogsett).English : Reaney and Wilson record a 17th-century example of this name in Devon. Evidently an uncomplimentary nickname meaning ‘hog’s head’, it is no longer found in the British Isles.
Boy/Male
Muslim
{h}name of Ganesh, {m}fire
Boy/Male
Indian
Selflessness, Eminent, {m}fascinating, {h}lord Shiva
Boy/Male
Tamil
Selflessness, Eminent, {m}fascinating, {h}lord Shiva
Surname or Lastname
English
English : variant of Osmer with an inorganic initial H-.
Boy/Male
Muslim
Selflessness, Eminent, {m}fascinating, {h}lord Shiva
Boy/Male
Hindu
Selflessness, Eminent, {m}fascinating, {h}lord Shiva
Boy/Male
Muslim
The opener, The judge
Boy/Male
Indian
The opener, The judge
Girl/Female
Muslim
{h}goddess Parvati {m}almost perfect, Invisible
Girl/Female
Tamil
{h}goddess Parvati {m}almost perfect, Invisible
Girl/Female
Muslim
{h}goddess Parvati {m}almost perfect, Invisible
Girl/Female
Arabic, Muslim
Sultana
Female
Hungarian
Hungarian legend name of the mother of the Hungarian people, possibly ENÉH means "deer."
Boy/Male
Hindu
{h}lord Vishnu, {m}bright night
Boy/Male
Tamil
{h}lord Vishnu, {m}bright night
Girl/Female
Hindu
{h}goddess Parvati {m}almost perfect, Invisible
Boy/Male
Indian
{h}name of Ganesh, {m}fire
H VECTOR
H VECTOR
Girl/Female
Gaelic
Feminine of Kyle.
Girl/Female
Australian, Danish, Finnish, Swedish
Perhaps; Probably; Pearl
Girl/Female
Gujarati, Indian, Kannada
To Destroy
Biblical
the shadow of his heat
Surname or Lastname
English and Scottish
English and Scottish : occupational name for a seller of spices and perfumes, from an agent derivative of Middle English, Old French basme, balme, ba(u)me ‘balm’, ‘ointment’ (Latin balsamum ‘aromatic resin’).South German and Swiss German : habitational name from any of the places in Switzerland and Baden called Balm, which almost certainly get their names from a Celtic word meaning ‘cave’.German : from the Germanic personal name Baldemar, composed of the elements bald ‘bold’ + mar ‘famous’.
Female
Hebrew
(× Ö´×¡Ö¸×”) Variant spelling of Hebrew Nisa, NISSA means "to test."
Boy/Male
Tamil
Purushottam | பà¯à®°à¯à®·à¯‹à®¤à¯à®¤à®®
Lord Vishnu, Best among men
Surname or Lastname
English
English : variant of Holliman.
Boy/Male
Indian
Helper of God, One who helps, Assister, Friend, One who scatters, Exposer, Announcer, Protector, Supporter
Boy/Male
Tamil
Attractive
H VECTOR
H VECTOR
H VECTOR
H VECTOR
H VECTOR
n.
The sixtieth part of an hour; sixty seconds. (Abbrev. m.; as, 4 h. 30 m.)
n.
A name given to the factors of a continued product when the former are derivable from one and the same function F(x) by successively imparting a constant increment or decrement h to the independent variable. Thus the product F(x).F(x + h).F(x + 2h) . . . F[x + (n-1)h] is called a factorial term, and its several factors take the name of factorials.
a.
Designating the acid proper (C5H10(CO2/H)2) which is obtained from camphoric acid.
a.
Pertaining to, or obtained from, the rowan tree, or sorb; specifically, designating an acid, C/H/CO/H, of the acetylene series, found in the unripe berries of this tree, and extracted as a white crystalline substance.
a.
Applied as an appellation to a kind of shell invented by Gen. H. Shrapnel of the British army.
n.
A rough breathing; an aspirate, as the letter h; also, a mark to denote aspiration; a breathing.
n.
A binary compound of sulphion, or one so regarded; thus, sulphuric acid, H/SO/, is a sulphionide.
n.
The letter h or H.
a.
Pronounced with the h sound or with audible breath.
n.
A species of Hirneola (H. auricula), a membranaceous fungus, called also auricula Judae, or Jew's-ear.
n.
Any animal of the genus Hyrax, of which about four species are known. They constitute the order Hyracoidea. The best known species are the daman (H. Syriacus) of Palestine, and the klipdas (H. capensis) of South Africa. Other species are H. arboreus and H. Sylvestris, the former from Southern, and the latter from Western, Africa. See Daman.
n.
Any North American river chub of the genus Hybopsis, esp. H. biguttatus.
n.
The rough breathing; a mark (/) placed over an initial vowel sound or over / to show that it is aspirated, that is, pronounced with h before it; thus "ws, pronounced h/s, "rh`twr, pronounced hra"t/r.
n.
A sound consisting of, or characterized by, a breath like the sound of h; the breathing h or a character representing such a sound; an aspirated sound.
n.
A name given to any species of the genus Helianthemum, low shrubs or herbs with yellow flowers, especially the European H. vulgare and the American frostweed, H. Canadense.
n.
An aquatic plant of the genus Hippuris (H. vulgaris), having narrow leaves in whorls.