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tristful
tristich
tristimulus values
Tristram and Isolde
trisulfide
trisyllable
tritanopia
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tritheism
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triticale
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trisoctahedron
tris·oc·ta·he·dron [ tri sòktə hdrən ] (plural tris·oc·ta·he·drons or tris·oc·ta·he·dra [ tri sòktə hdrə ])


noun 
Definition:
 
solid with 24 identical faces: a solid with 24 identical triangular faces, each triplet of which rests on a face of an underlying octahedron
[Mid-19th century. < Greek tris "thrice"]

tris·oc·ta·he·dral adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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