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Noun[edit] cavity â(plural cavities) 1  A hole or hollow depression. 2  A hollow area within the body (such as the sinuses). ( dentistry) A soft area in a decayed tooth.
(Äsâ²Ä­-tÄbâ²yÉ-lÉm) n. pl. acÂ·eÂ·tabÂ·uÂ·la (-lÉ) 1. Anatomy The cup-shaped cavity at the base of the hipbone into which the ball-shaped head of the femur fits. 2. Zoology A cavity or socket in the body of an insect into which an appendage fits.