noun, plural trisoctahedrons, trisoctahedra [tris-ok-tuh-hee-druh] .
a solid bounded by 24 identical faces in groups of three, each group corresponding to one face of an octahedron.

1840–50; < Greek trís thrice + octohedron

trisoctahedral, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trisoctahedron (trɪsˌɒktəˈhiːdrən)
n , pl -drons, -dra
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]

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