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crust

noun

    1. the hard, crisp outer part of bread
    2. a piece of this
    3. any dry, hard piece of bread
  1. the pastry shell of a pie
  2. any hard surface layer, as of snow or soil
  3. a hard deposit formed by wine on the inside surface of a bottle
  4. Slang audacity; insolence; gall
  5. Geol. the solid, rocky outer portion or shell of the earth; lithosphere
  6. Med. a dry, hard outer layer of blood, pus, or other bodily secretion

transitive verb, intransitive verb

  1. to cover or become covered with a crust
  2. to form or harden into a crust

See crust in American Heritage Dictionary 4

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