Crust

n.	1.	The hard external coat or covering of anything; the hard exterior surface or outer shell; an incrustation; as, a crust of snow. I have known the statute of an emperor quite hid under a crust of dross. - Addison. Below this icy crust of conformity, the waters of infidelity lay dark and deep as ever. - Prescott.
	2.	(Cookery) The hard exterior or surface of bread, in distinction from the soft part or crumb; or a piece of bread grown dry or hard. Th' impenetrable crust thy teeth defies. - Dryden. He that keeps nor crust nor crumb. - Shak. They . . . made the crust for the venison pasty. - Macaulay.
	3.	(Geol.) The exterior portion of the earth, formerly universally supposed to inclose a molten interior.
	4.	(Zool.) The shell of crabs, lobsters, etc.
	5.	(Med.) A hard mass, made up of dried secretions blood, or pus, occurring upon the surface of the body.
	6.	An incrustation on the interior of wine bottles, the result of the ripening of the wine; a deposit of tartar, etc. See Beeswing.
v. t.	1.	To cover with a crust; to cover or line with an incrustation; to incrust. [imp. & p. p. Crusted; p. pr. & vb. n. Crusting.] The whole body is crusted over with ice. - Boyle. And now their legs, and breast, and bodies stood Crusted with bark. - Addison. Very foul and crusted bottles. - Swift. Their minds are crusted over, like diamonds in the rock. - Felton.
v. i.	1.	To gather or contract into a hard crust; to become incrusted. The place that was burnt . . . crusted and healed. - Temple.

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

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