From Longman Dictionary of Contemporary Englishpolyhedronpol‧y‧he‧dron /ˌpɒlɪˈhiːdrən $ ˌpɑː-/ noun [countable] technical HMa solid shape with many sides
Examples from the Corpus
polyhedron• Positive form can be introduced into any polygon or polyhedron by regarding it as a closed skin subjected to internal expansion.Origin polyhedron (1500-1600) Greek polyedron, from hedra “base” 