noun, plural tet·ra·he·drons, tet·ra·he·dra [te-truh-hee-druh] /ˌtɛ trəˈhi drə/.
Origin of tetrahedron
Examples from the Web for tetrahedron
Historical Examples of tetrahedron
A scalene triangle abc might also be employed, or a tetrahedron.
The Tetrahedron, having four equilateral triangles as faces.Bygone Beliefs
H. Stanley Redgrove
Its head was a pyramid, a tetrahedron; its length vanished in the further darkness.The Metal Monster
It occurs crystallized in the form of the tetrahedron, also massive and disseminated.The New Gresham Encyclopedia
Round Mars describe a tetrahedron; the sphere including this will be Jupiter.Kepler
Walter W. Bryant
noun plural -drons or -dra (-drə)
Word Origin for tetrahedron
solid figure contained by four triangular surfaces, 1560s, from Late Greek tetraedron, originally neuter of tetraedros (adj.) "four-sided," from tetra- "four" + hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit" (see sedentary).