pentahedron
noun/ˌpentəˈhiːdrən/
/ˌpentəˈhiːdrən/
(geometry)- a solid shape with five flat sidesTopics Colours and Shapesc2Word Originlate 18th cent.: from penta- ‘five’ + -hedron, on the pattern of words such as polyhedron.
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pentahedron