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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.
â¢ NASAL CAVITY (noun) The noun NASAL CAVITY has 1 sense: 1. either of the two cavities lying between the floor of the cranium and the roof of the mouth and extending from the face to the pharynx. Familiarity information: NASAL CAVITY used as a noun is very rare.