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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.
pulp cavity. the pulp-filled central chamber in a tooth; called also dental cavity. serous cavity. a celomic cavity, like that enclosed by the pericardium, peritoneum or pleura, not communicating with the outside of the body and lined with a serous membrane, i.e. one which secretes a serous fluid.ymÂ·panÂ·ic cavÂ·iÂ·ty. An air chamber in the temporal bone, medial to the tympanic membrane, between the external acoustic meatus and the inner ear containing the ossicles. Synonym(s): cavity of middle ear.