/ ˌpɒliˈhiːdrən; -ˈhed-; NAmE ˌpɑːli-/ noun
( pl. poly·he·dra / -ˈhiːdrə; NAmE ; -ˈhed-/ or poly·he·drons ) ( geometry ) a solid shape with many flat sides, usually more than six
► poly·he·dral adjective
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WORD ORIGIN
late 16th cent.: from Greek poluedron , neuter (used as a noun) of poluedros many-sided.