1. mastoid - Noun
2. mastoid - Adjective
Resembling the nipple or the breast; -- applied specifically to a process of the temporal bone behind the ear.
Pertaining to, or in the region of, the mastoid process; mastoidal.
Source: Webster's dictionaryM Mastoid back portion of the temporal bone that contains the inner ear. Source: Internet
Mastoid surgery surgical procedure to remove infection from the mastoid bone. Source: Internet