Noun
ratio (in percent) of the maximum breadth to the maximum length of a skull
Source: WordNetA number of later writers, such as the French anthropologist Vacher de Lapouge in his book L'Aryen, argued that this superior branch could be identified biologically by using the cephalic index (a measure of head shape) and other indicators. Source: Internet
The cephalic index or cranial index is the ratio of the maximum width of the head of an organism (human or animal) multiplied by 100 divided by its maximum length (i. Source: Internet