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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.
A body cavity is any fluid-filled space in a multicellular organism other than those of vessels (such as blood vessels and lymph vessels).The term usually refers to the space located between an animal âs outer covering (epidermis), and the outer lining of the gut cavity, where internal organs develop.he human body cavity normally refers to the ventral body cavity, because it is by far the largest.