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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.
Top 10 facts about the world. Technically speaking, a body cavity is any space in an organism that is filled by viscera, or fluid. In practice, however, the term is usually used to refer to the space between the skin and the lining of the gut cavity.