Mastoid
Mastoid , adjective
[Greek {not transcribed}; masto`s the breast + e'i^dos form: compare French mastoide.]
(a)
(Anatomy) Resembling the nipple or the breast; -- applied specifically to a process of the temporal bone behind the ear.
(b)
(Anatomy) Pertaining to, or in the region of, the mastoid process; mastoidal.