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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.
1. (Zoology) the body cavity of many multicellular animals, situated in the mesoderm and containing the digestive tract and other visceral organs. [C19: from Greek koilÅma cavity, from koilos hollow; see coel-]. (Ësi lÉm). (-loÊm). n., pl. coeâ¢loms, coeâ¢loâ¢maâ¢ta (sÉªËloÊ mÉ tÉ) also coeâ¢lomes.