Definify.com
Webster 1913 Edition
Icosahedron
Iˊco-sa-he′dron
,Noun.
[Gr. [GREEK]; [GREEK] twenty + [GREEK] seat, base, fr. [GREEK] to sit.]
(Geom.)
A solid bounded by twenty sides or faces.
Regular icosahedron
, one of the five regular polyhedrons, bounded by twenty equilateral triangules. Five triangles meet to form each solid angle of the polyhedron.
Webster 1828 Edition
Icosahedron
ICOSAHE'DRON
,Noun.
In geometry, a regular solid, consisting of twenty triangular pyramids, whose vertices meet in the center of a sphere supposed to circumscribe it, and therefore have their highths and bases equal.
Definition 2024
icosahedron
icosahedron
English
A regular icosahedron
Alternative forms
- eicosaedrum (obsolete)
- icosaedrum (obsolete)
Noun
icosahedron (plural icosahedra or icosahedrons)
- (geometry) A polyhedron with twenty faces.
- (geometry, specifically) A regular icosahedron: one of the Platonic solids, all of whose faces are regular (equilateral) triangles
Translations
a polyhedron