decahedron/ˌdɛkəˈhiːdɹən/decahedron means A polyhedron with ten faces. Lexicurio rates it Sui generis — a strength score of 88 out of 100.decahedron is pronounced /ˌdɛkəˈhiːdɹən/.EtymologyFrom deca- + -hedron.nounA polyhedron with ten faces.