- a solid figure having 20 faces.
Origin of icosahedron
Examples from the Web for icosahedron
Historical Examples of icosahedron
The Icosahedron, having twenty equilateral triangles as faces.Bygone Beliefs
H. Stanley Redgrove
Associated words: vicenary, vigesimal, vigesimation, icosahedron.Putnam's Word Book
Louis A. Flemming
These give the solid angles of the tetrahedron, the octahedron and the icosahedron.
Within the earth's orbit inscribe an icosahedron: the sphere inscribed in it will be Venus's orbit.
Now, inscribe in the Earth an icosahedron, the circle inscribed in it will be Venus.
- a solid figure having 20 faces. The faces of a regular icosahedron are equilateral triangles
Word Origin for icosahedron
1560s, from Greek eikosahedron, neuter of eikosahedros, from eikosi "twenty" + -hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit" (see sedentary). Greek eikosi is from PIE *wikmti- "twenty," from *wi- "in half," hence "two" + (d)kmti-, from root *dekm- "ten" (see ten).
- A polyhedron having twenty faces.