1. • noun - the outer layer of the Earth
   • noun - a hard outer layer that covers something
   • noun - the trait of being rude and impertinent
   • verb - form a crust or form into a crust
2. • The hard outer portion or surface area of bread.
   • A piece of bread consisting mostly of the hard outer portion.
   • A piece of bread that has become hard and dry.
   • A pastry shell, as of a pie or tart.
   • A hard, crisp covering or surface: snow with a firm crust.
   • A hard deposit formed on the interior of a wine bottle as the wine matures.
   • Geology.
   • The exterior portion of the earth that lies above the Mohorovi?i> discontinuity.
   • The outermost solid layer of a planet or moon.
   • The hard outer covering or integument of certain plants and animals, such as lichens and crustaceans.
   • An outer layer or coating formed by the drying of a bodily exudate such as pus or blood; a scab.
   • Insolence; audacity; gall.
   • To cover with a crust.
   • To form into a crust.
   • To become covered with a crust.
   • To harden into a crust.
3. • v - to form a crust (a hardened outer surface)

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