Mastoid
Pronunciation : Mas"toid
Part of Speech : a.
Etymology : [Gr. masto?de.] (Anat.) (a) Resembling the nipple or the breast; -- applied specifically to a process of the temporal bone behind the ear. (b) Pertaining to, or in the region of, the mastoid process; mastoidal.
Source : Webster's Unabridged Dictionary, 1913