tetrahedron
noun/ˌtetrəˈhiːdrən/
/ˌtetrəˈhiːdrən/
(geometry)- a solid shape with four flat sides that are trianglesTopics Colours and Shapesc2Word Originlate 16th cent.: from late Greek tetraedron, neuter (used as a noun) of tetraedros ‘four-sided’.
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tetrahedron