Cavity \Cav"i*ty\, n.; pl. Cavities. [L. cavus hollow: cf. F. cavit['e].]

1. Hollowness. [Obs.]

The cavity or hollowness of the place. --Goodwin.

2. A hollow place; a hollow; as, the abdominal cavity.

An instrument with a small cavity, like a small spoon. --Arbuthnot.

Abnormal spaces or excavations are frequently formed in the lungs, which are designated cavities or vomic[ae]. --Quain.

Body cavity, the c[oe]lum. See under Body.

Source: Webster's Revised Unabridged Dictionary (1913)