Mās'toid1, n.
n. (Anat.) A bone of the skull. See SKULL.
2 entries under this word
Mastoid
Mās'toid2, a.
a. [Fr. mastoïde, It. mastoideo, Gr. μαστοειδής, from μαστός, the breast of a woman, and εἶδος, form.] Resembling the nipple or breast; as, the mastoid process of the temporal bone.