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cavity

From Wiktionary
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The Simple English Wikipedia has an article on:

Pronunciation

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Noun

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Singular
cavity

Plural
cavities

  1. (countable) A cavity is a hole or hollow area.
  2. (countable) A cavity is a hollow area inside the body (like the sinuses).
  3. (countable) A cavity is a hole in a decayed tooth.
    You have a cavity in your back teeth.