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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.
Define thoracic cavity. thoracic cavity synonyms, thoracic cavity pronunciation, thoracic cavity translation, English dictionary definition of thoracic cavity. Noun 1. thoracic cavity - the cavity in the vertebrate body enclosed by the ribs between the diaphragm and the neck and containing the lungs and heart chest...