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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.
the cavity, containing marrow, in the diaphysis of a long bone; called also medullary canal. nasal cavity. the proximal part of the respiratory tract, within the nose, bisected by the nasal septum and extending from the nares to the pharynx.. a hollow or space, or a potential space, within the body or one of its organs; called also caverna and cavum. 2. the lesion produced by dental caries. Cavities in the body. From Applegate, 2000. abdominal cavity the cavity of the body between the diaphragm above and the pelvis below, containing the abdominal organs.