Pronunciation: (kav'i-tē), [key]
1. any hollow place; hollow.
2. Anat.a hollow space within the body, an organ, a bone, etc.
3. a hollow space or a pit in a tooth, most commonly produced by caries. A cavity may be artificially made to support dental restorations.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.