n.
pl.tris·oc·ta·he·drons or tris·oc·ta·he·dra (-drə)
A solid figure having 24 equal faces, every three of which correspond to one face of an octahedron.
[Greek tris, thrice; see trei- in Indo-European roots + octahedron.]
tris·oc'ta·he'dral (-drəl) adj.
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