crust - definition and synonyms

noun [countable/uncountable] 

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  1. 1
    the hard brown outer part of a loaf of bread
    a crust of bread:

    Sparrows pecked at a crust of bread.

  2. 2
    a layer of cooked pastry that forms the outer part of a pie. The inner part is called the filling.
  3. 3
    the thick outer surface of the Earth or another planet
    the Earth’s crust:

    Molten lava rose up from beneath the Earth’s crust.

  4. 4
    a hard layer of a substance covering a softer substance or a liquid

    I washed the crust of make-up from my face.