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trigonal
trigonometric
trigonometric function
trigonometry
trigonous
trigram
trigraph
trihalomethane
trihedron
trihydric
triiodothyronine
trijet
trike
trilateral
trilateralism
trilateration
trilby
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trihedron

tri·he·dron [ trī hdrən ] (plural tri·he·drons or tri·he·dra [ trī hdrə ]) or tri·he·dral [ trī hdrəl ] (plural tri·he·drals)


noun 
Definition:
 
geometric figure: a three-dimensional geometric figure formed by the intersection of three planes


tri·he·dral adjective
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