Enter Member/Subscriber ID below as it appears on your BlueCross BlueShield of Tennessee ID card. For example, enter ID number ZEC415012018 as * * *
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.
cranial cavity the space enclosed by the bones of the cranium. glenoid cavity a depression in the lateral angle of the scapula for articulation with the humerus. marrow cavity (medullary cavity) the cavity that contains bone marrow in the diaphysis of a long bone; called also medullary canal.