From The Collaborative International Dictionary of English v.0.48:
Cavity \Cav"i*ty\, n.; pl. Cavities. [L. cavus hollow: cf. F.
cavit['e].]
1. Hollowness. [Obs.]
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The cavity or hollowness of the place. --Goodwin.
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2. A hollow place; a hollow; as, the abdominal cavity.
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An instrument with a small cavity, like a small
spoon. --Arbuthnot.
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Abnormal spaces or excavations are frequently formed
in the lungs, which are designated cavities or
vomic[ae]. --Quain.
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Body cavity, the c[oe]lum. See under Body.
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