Late 17th century; earliest use found in Ralph Cudworth (1617–1688), philosopher and theologian. Either from Hellenistic Greek πολύεδρος + -ous, or from polyhedron + -ous.
Definition of polyhedrous in US English:
polyhedrous
adjectiveˌpɒlɪˈhiːdrəs
Polyhedral.
Origin
Late 17th century; earliest use found in Ralph Cudworth (1617–1688), philosopher and theologian. Either from Hellenistic Greek πολύεδρος + -ous, or from polyhedron + -ous.