concave polyhedron concave polygon • concaver · · · Info · Definitions · Characters · · concave polyhedron · · Text Common · · Latin · · Scripts 18 · · Length 6 · · Syllables Definitions · · · (noun) a polyhedron some of whose plane sections are concave polygons. Synonyms: concave polyhedron. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 v latin small letter v U+0076 y latin small letter y U+0079