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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.
[Gr. four, and side.] In geometry, a figure comprehended under four equilateral and equal triangles; or one of the five regular Platonic bodies of that figure.

Definition 2024

tetrahedron

tetrahedron

English

A rotating tetrahedron

Noun

tetrahedron ‎(plural tetrahedrons or tetrahedra)

  1. (geometry) a polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.

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Translations

Etymology

From Ancient Greek τετράεδρον ‎(tetráedron, “triangle-based pyramid”), from τετράεδρος ‎(tetráedros), from τετράς ‎(tetrás, “four”) + ἕδρα ‎(hédra, “seat”); synchronically analyzable as tetra- +‎ -hedron.

Pronunciation

  • enPR: tĕtrəhē'drən, IPA(key): /tɛtrəˈhiːdrən/

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