【医】 枕骨

[ noun ]
a saucer-shaped membrane bone that forms the back of the skull
<noun.body>

Occipital \Oc*cip"i*tal\, a. [Cf. F. occipital.] (Anat.)
Of or pertaining to the occiput, or back part of the head, or
to the occipital bone.

{Occipital bone} (Anat.), the bone which forms the posterior
segment of the skull and surrounds the great foramen by
which the spinal cord leaves the cranium. In the higher
vertebrates it is usually composed of four bones, which
become consolidated in the adult.

{Occipital point} (Anat.), the point of the occiput in the
mesial plane farthest from the ophryon.