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pentahedron

noun
🔊/ˌpentəˈhiːdrən/
🔊/ˌpentəˈhiːdrən/
 (geometry几何)
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  1. a solid shape with five flat sides五面体Topics Colours and Shapesc2
    Word Originlate 18th cent.: from penta- ‘five’ + -hedron, on the pattern of words such as polyhedron.