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Webster 1913 Edition

Noun.

[Gr. [GREEK] thrice + FE.

octahedron

(Crystallog.)

A solid of the isometric system bounded by twenty-four equal faces, three corresponding to each face of an octahedron.

Tetragonal trisoctahedron

a trisoctahedron each face of which is a quadrilateral; called also

trapezohedron

and

icositetrahedron

–

Trigonal trisoctahedron

a trisoctahedron each face of which is an isosceles triangle.

trisoctahedron ‎(plural trisoctahedrons or trisoctahedra)

(crystallography) A solid of the isometric system bounded by 24 equal faces, three corresponding to each face of an octahedron.