Mas″toid (?), a. [Gr. �; μαστόσ the breast + εἰ̑δοσ form: cf. F. mastoïde.] (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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.