tetrahedron
noun /ˌtetrəˈhiːdrən/
/ˌtetrəˈhiːdrən/
(geometry)- enlarge imagea 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’.