1.Definition: (anatomy) a natural hollow or sinus within the body

Related Noun(s):cavum

Category: General

2.Definition: a sizeable hole (usually in the ground)

Related Noun(s):pit

Category: Objects

3.Definition: soft decayed area in a tooth; progressive decay can lead to the death of a tooth

Related Noun(s):caries

Category: General

4.Definition: space that is surrounded by something

Category: General