cavity

Noun

• (anatomy) a natural hollow or sinus within the body

• soft decayed area in a tooth; progressive decay can lead to the death of a tooth

• space that is surrounded by something

• a sizeable hole (usually in the ground)
  • they dug a pit to bury the body
    

Related words

• Synonyms: 
  bodily cavity , cavum , caries , dental caries , tooth decay , enclosed space , pit