# tetrahedron

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Related to tetrahedra: regular tetrahedron

## tet·ra·he·dron

(tĕt′rə-hē′drən)*n.*

*pl.*

**tet·ra·he·drons**or

**tet·ra·he·dra**(-drə)

A polyhedron with four faces.

[Greek tetraedron, from neuter of tetraedros,

*four-faced*: tetra-,*tetra-*+ -hedros,*sided*; see**-hedron**.]## tetrahedron

(ˌtɛtrəˈhiːdrən)*n*,

*pl*

**-drons**

*or*

**-dra**(-drə)

**1.**(Mathematics) a solid figure having four plane faces. A

**regular tetrahedron**has faces that are equilateral triangles. See also polyhedron

**2.**(Mathematics) any object shaped like a tetrahedron

[C16: from New Latin, from Late Greek

*tetraedron;*see tetra-, -hedron]**ˌtetraˈhedral**

*adj*

**ˌtetraˈhedrally**

*adv*

## tet•ra•he•dron

(ˌtɛ trəˈhi drən)*n.,*

*pl.*

**-drons, -dra**(-drə).

**1.**a solid contained by four plane faces; a triangular pyramid.

**2.**any of various objects resembling a tetrahedron.

[1560–70; < Late Greek

*tetráedron*]## tet·ra·he·dron

(tĕt′rə-hē′drən) A three-dimensional geometric figure with four triangular faces.

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Noun | 1. | tetrahedron - any polyhedron having four plane facespolyhedron - a solid figure bounded by plane polygons or faces |

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