- a solid bounded by 24 identical faces in groups of three, each group corresponding to one face of an octahedron.
Origin of trisoctahedron
1840–50; < Greek trís thrice + octohedron
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a solid figure having 24 identical triangular faces, groups of three faces being formed on an underlying octahedron
C19: from Greek tris three times + octahedron