n.ratio (in percent) of the maximum breadth to the maximum length of a skull
同义词：cephalic indexbreadth index
英汉双解大词典
cranial index
1.
N（名词）
the ratio of the greatest length to the greatest width of the cranium, multiplied by 100: used in comparative anthropology 颅指数; 用于比较人类学 → compare cephalic index