A kind of speleothem, formed as calcite crystallizes on a nucleus such as a grain of sand, in much the same way that a biological pearl forms within a mollusc.

The 18th sura (chapter) of the Qur'an. / A surname.

plural of vena cava

plural of body cavity search

(law) A search performed by law enforcement on a criminal suspect to insure that the suspect is not hiding anything in a body cavity.

histoplasmosis

plural of cavity wall

The thoracic cavity.

(medicine) A chamber located within the upper human torso (and other animal bodies) which contains the heart and lungs.

A form of waveguide, closed at each end, used to create an intense electromagnetic wave