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# All Words Glossary

Glossary of Math Terms
beginning with letter H
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 haversine  noun
1. (trigonometry) The haversed sine.
 Heaviside unit function  noun
1. (mathematics) The function whose value is zero if its independent variable is negative, and one otherwise
 helical  adjective
1. in the shape of a helix
 helices  noun
1. (plural of, helix)
 helix  noun (helixes, pl2=helices)
1. (mathematics) A curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three-dimensional curve seen in a screw or a spiral staircase.
2. (architecture) A small volute under the abacus of a Corinthian capital.
3. (anatomy) The incurved rim of the external ear.
proper nounHelix
1. (zoology) A genus of land snail containing many species.
 hemisphere  noun
1. (geometry) A half-sphere, formed by a plane intersecting the center of a sphere.
2. (geography) Half of the Earth, the Northern Hemisphere, Southern Hemisphere, Western Hemisphere or Eastern Hemisphere.
3. (anatomy) Either of the two halves of the cerebrum.
 hendecagon  noun (pluralhendecagons)
1. (geometry) A polygon with eleven sides and eleven angles.
 heptad  noun
1. a group of seven things
 heptagon  noun (plural:heptagons)
1. (geometry) A polygon with seven sides and seven angles.
 heptagonal  adjective
1. Having seven angles and sides.
 heptahedron  noun (plural=heptahedra or heptahedrons)
1. (mathematics) any polyhedron having seven faces
 hex  noun (hexes)
1. An evil spell or curse.
2. A witch.
verb (hexes, hexing, hexed)
1. To put a hex on.
 hexad  noun
1. A group of six.
 hexagon  noun
1. (geometry) A polygon with six sides and six angles.
 hexagonal  adjective
1. (geometry) Having six edges, or having a cross-section in the form of a hexagon.
Nuts in engineering are generally hexagonal.
1. (crystallography) Having three equal axis which cross at 60° angles, and an unequal axis which crosses the others at 90° angle.
 hexagram  noun
1. A hollow six-pointed star formed by overlapping two equilateral triangles; the Star of David.
2. Any of the 64 sets of solid and broken lines used for divination in the I Ching.
3. A large silver coin minted during the Byzantine, Byzantine Empire.
 hexahedron  noun (pl2=hexahedra)
1. (geometry) A polyhedron with six faces; the regular hexahedron is more commonly called the cube and is one of the Platonic solids.
 Hilbert space  noun
1. (mathematics) A generalized Euclidean space in which mathematical functions take the place of points; crucial to the understanding of quantum mechanics and other applications.
 homothetic  adjective
1. (mathematics) of a function of two or more variables in which the ratio of the partial derivatives depends only on the ratio of the variables, not their value
2. (economics) in which the ratio of goods demanded depends only on the ratio of their prices
3. the relationship of a microcosm to a macrocosm
 hundred  noun (pluralhundreds)
1. A hundred-dollar bill.
2. (historical) An administrative subdivision in southern English counties and other countries.
3. (cricket) a hundred runs scored by a batsman
He made a in the historic match.
 hundredth  noun
1. The person or thing in the hundredth position.
2. One of a hundred equal parts of a whole. Called also percent.
adjective
1. The ordinal form of the number hundred, one hundred.
 hyperbolic function  noun
1. (mathematics) A function that is derived from some arithmetic operations on the exponential function with base e and the inverse function, and was named after the corresponding similar trigonometric function.
 hypergeometric distribution  noun
1. (probability theory) A discrete probability distribution that describes the number of successes in a sequence of n draws from a finite population without replacement.
 hypergeometric function  noun
1. (mathematics) Any function that is a solution of the hypergeometric equation; usually an expansion of an infinite series
 hyperspace  noun
1. (math) An n-dimensional Euclidian space with n > 3.
2. (math) A Euclidian space of unspecified dimension.
3. (scifi) A notional space orthogonal to the usual dimensions of space-time often used for faster-than-light travel.
We can only get to the Nimrodian Galaxy if we go through .
1. (Video games): A means of teleporting one's character.
I was totally surrounded, so I had to hit .
 hypersphere  noun
1. (geometry) The set of all points in a given hyperspace that are at a given distance from a given point.
 hypersurface  noun
1. (mathematics) A -dimensional surface in a space (often a Euclidean space) of dimension +1
 hypocycloid  noun (pluralhypocycloids)
1. (geometry) The locus of a point on the circumference of a circle that rolls without slipping inside the circumference of another circle.
 hypotenuse  noun
1. (geometry) The side of a right triangle opposite the right angle.

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