trihedron
trihedron[trʌɪˈhiːdrən, -ˈhɛdrən](pl. trihedra -drə 或 trihedrons)- a solid figure having three sides or faces (in addition to the base or ends)
三面体
语源- early 19th cent.: from tri- 'three' + -hedron, on the pattern of words such as polyhedron
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