Definition of crust
1a : the hardened exterior or surface part of bread
b : a piece of this or of bread grown dry or hard
2a : the pastry shell of a pie : piecrust
b : the bready layer that forms the foundation of a pizza
3 : a hard or brittle external coat or covering: such as
a : a hard surface layer (as of soil or snow)
b : the outer part of a planet, moon, or asteroid composed essentially of crystalline rocks
c : a deposit built up on the interior surface of a wine bottle during long aging
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Time Traveler for crust
The first known use of crust was in the 14th century
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