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Definition of pentahedron noun from the Oxford Advanced Learner's Dictionary

pentahedron

noun
 
/ˌpentəˈhiːdrən/
 
/ˌpentəˈhiːdrən/
(geometry)
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  1. a solid shape with five flat sidesTopics Colours and Shapesc2
    Word Originlate 18th cent.: from penta- ‘five’ + -hedron, on the pattern of words such as polyhedron.
See pentahedron in the Oxford Advanced American Dictionary
trait
noun
 
 
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