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Webster 1913 Edition
Tetrahedron
Tetˊra-he′dron
,Noun.
[
Tetra-
+ Gr. [GREEK] seat, base, fr. [GREEK] to sit.] (Geom.)
A solid figure inclosed or bounded by four triangles.
☞ In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron.
Regular tetrahedron
(Geom.)
, a solid bounded by four equal equilateral triangles; one of the five regular solids.
Webster 1828 Edition
Tetrahedron
TETRAHE'DRON
,Noun.
Definition 2025
tetrahedron
tetrahedron
English
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A rotating tetrahedron
Noun
tetrahedron (plural tetrahedrons or tetrahedra)
- (geometry) a polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.
Related terms
Translations
polyhedron
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