the most prominent point at the back of the head, used as a point of measurement in craniometry
Word origin
C19: from Greek: back of the head
inion in American English
(ˈɪniən; ˈɪniˌɑn)
noun
the bulging part at the rear of the human skull
Word origin
ModL < Gr, the back of the head < is (gen. inos), sinew, muscle, lit., strength, akin to L vis, strength < IE *wīs- < base *wei-, to strive forward, > L via