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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.
Noun. 1. buccal cavity-the cavity between the jaws and the cheeks. mouth, oral cavity, oral fissure, rima oris-the opening through which food is taken in and vocalizations emerge; he stuffed his mouth with candy.oun. 1. buccal cavity-the cavity between the jaws and the cheeks. mouth, oral cavity, oral fissure, rima oris-the opening through which food is taken in and vocalizations emerge; he stuffed his mouth with candy.