occipital (adj.)

"of, on, or in the back of the head," 1540s, from Middle French occipital, from Medieval Latin occipitalis, from Latin occiput (genitive occipitis) "back of the skull," from assimilated form of ob "in the way of, against," here with a sense of "in back of" (see ob-) + caput "head" (from PIE root *kaput- "head"). As a noun, "the occipital bone," from 1758. Middle English had occiput (n.) "back of the head" and occipiciale (n.) "occipital bone."