Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A solid figure having 24 equal faces, every three of which correspond to one face of an octahedron.
from The Century Dictionary.
- noun This name is usually limited to the isometric form having triangular faces, formerly called a trigonal trisoctahedron.
- noun In crystallography, a solid bounded by twenty-four equal faces, three corresponding to each face of an octahedron.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Crystallog.) A solid of the isometric system bounded by twenty-four equal faces, three corresponding to each face of an octahedron.
- noun a trisoctahedron each face of which is a quadrilateral; called also
trapezohedron andicositetrahedron . - noun a trisoctahedron each face of which is an isosceles triangle.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun crystallography A
solid of theisometric system bounded by 24equal faces , three corresponding to each face of anoctahedron .
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[Greek tris, thrice; see trei- in Indo-European roots + octahedron.]
from Wiktionary, Creative Commons Attribution/Share-Alike License
Ancient Greek thrice + English octahedron.
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Examples
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The garnet is usually in the form of a rhombic dodecahedron, or as a trisoctahedron (called also sometimes an icosatetrahedron), or a mixture of the two, though the stones appear in other cubic forms.
The Chemistry, Properties and Tests of Precious Stones John Mastin
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