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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.
Definition. noun, plural: body cavities. (1) Any space in the body of a multicellular organism, containing the viscera or fluid. (2) The space between the outer covering or epidermis and the outer lining of the gut cavity.nimals may be categorized according to the form or presence of body cavity: 1  coelomate animals such as vertebrates. 2  pseudocoelomate animals such as roundworms. 3  acoelomate animals such as flatworms.