noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A polyhedron containing 10 triangular faces, 15 edges, and 6 vertices.

Etymology

From hemi- + icosahedron, referring to the fact that it contains half the faces of a regular icosahedron.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.