cranial index cranial cavity • cranially · · · Info · Definitions · Synonyms · Characters · · cranial index · · Text Common · · Latin · · Scripts 13 · · Length 4 · · Syllables Definitions · · · (noun) ratio (in percent) of the maximum breadth to the maximum length of a skull. Synonyms: cephalic index, breadth index, cranial index. · · Noun Definition 1 Synonyms · · · cephalic index · · Synonym 1 breadth index · · Synonym 2 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 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E r latin small letter r U+0072 x latin small letter x U+0078