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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.
nasal cavity-either of the two cavities lying between the floor of the cranium and the roof of the mouth and extending from the face to the pharynx. nasopharynx-cavity forming the upper part of the pharynx. oropharynx-cavity formed by the pharynx at the back of the mouth. laryngopharynx-the lower part of the pharynx.