Crust - Definition

n 1: the outer layer of the Earth [syn: crust, Earth's
crust]
2: a hard outer layer that covers something [syn: crust,
incrustation, encrustation]
3: the trait of being rude and impertinent; inclined to take
liberties [syn: crust, gall, impertinence, impudence,
insolence, cheekiness, freshness]
v 1: form a crust or form into a crust; "The bread crusted in
the oven"