American Dictionary of the English Language

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CRUST, noun [Latin , G.]

1. An external coat or covering of a thing, which is hard or harder than the internal substance; as the crust of bread; the crust of snow; the crust of dross; the crust of a pie.

2. A piece of crust; a waste piece of bread.

3. A shell, as the hard covering of a crab and some other animals.

4. A scab.

5. The superficial substances of the earth are, in geology, called its crust

CRUST, verb transitive

1. To cover with a hard case or coat; to spread over the surface a substance harder than the matter covered; to incrust; as, to crust a thing with clay; to crust cake with sugar; crusted with bark.

2. To cover with concretions.

CRUST, verb intransitive To gather or contract into a hard covering; to concrete or freeze, as superficial matter.