"cavity" in the noun sense
1. pit, cavity
a sizeable hole (usually in the ground
"they dug a pit to bury the body"
2. cavity, enclosed space
space that is surrounded by something
3. cavity, caries, dental caries, tooth decay
soft decayed area in a tooth progressive decay can lead to the death of a tooth
4. cavity, bodily cavity, cavum
anatomy) a natural hollow or sinus within the body
Source: WordNet® (An amazing lexical database of English)
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