the brown, hard outer portion or surface of a loaf or slice of bread (distinguished from crumb ).
a slice of bread from the end of a loaf, consisting chiefly of this.
the pastry covering the outside of a pie or other dish.
a piece of stale bread.
any more or less hard external covering or coating: a crust of snow.
Geology. the outer layer of the earth, about 22 miles (35 km) deep under the continents (continental crust) and 6 miles (10 km) deep under the oceans (oceanic crust) Compare mantle ( def 3 ), core1 ( def 10 ).
a scab or eschar.
Slang. unabashed self-assertiveness; nerve; gall: He had a lot of crust going to the party without an invitation.
deposit from wine, as it ripens during aging, on the interior of bottles, consisting of tartar and coloring matter.
the hard outer shell or covering of an animal.
Australian Slang. a living or livelihood: What do you do for a crust?
verb (used with object)
to cover with or as with a crust; encrust.
to form (something) into a crust.
verb (used without object)
to form or contract a crust.
to form into a crust.

1275–1325; Middle English < Anglo-French, Old French cruste, croste < Latin crusta hard coating, crust

crustless, adjective
intercrust, verb (used with object)
undercrust, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crust (krʌst)
1.  a.  the hard outer part of bread
 b.  a piece of bread consisting mainly of this
2.  the baked shell of a pie, tart, etc
3.  any hard or stiff outer covering or surface: a crust of ice
4.  sial See also sima the solid outer shell of the earth, with an average thickness of 30--35 km in continental regions and 5 km beneath the oceans, forming the upper part of the lithosphere and lying immediately above the mantle, from which it is separated by the Mohorovičić discontinuity
5.  the dry covering of a skin sore or lesion; scab
6.  a layer of acid potassium tartrate deposited by some wine, esp port, on the inside of the bottle
7.  the hard outer layer of such organisms as lichens and crustaceans
8.  slang impertinence
9.  slang (Brit), (Austral), (NZ) a living (esp in the phrase earn a crust)
10.  to cover with or acquire a crust
11.  to form or be formed into a crust
[C14: from Latin crūsta hard surface, rind, shell]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 14c., from L. crusta "rind, crust, shell, bark," from PIE *krus-to-, from base *kreus- "to begin to freeze, form a crust" (cf. Skt. krud- "make hard, thicken;" Avestan xruzdra- "hard;" Gk. krystallos "ice, crystal," kryos "icy cold, frost;" Lett. kruwesis "frozen mud;" O.H.G. hrosa "ice, crust;"
O.E. hruse "earth;" O.N. hroðr "scurf"). Meaning "outer shell of the earth" is from 1550s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

crust (krŭst)

  1. A hard, crisp covering or surface.

  2. An outer layer or coating formed by the drying of a bodily exudate such as pus or blood; a scab.

v. crust·ed, crust·ing, crusts
To cover with, become covered with, or harden into a crust.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
crust   (krŭst)  Pronunciation Key 
The solid, outermost layer of the Earth, lying above the mantle. ◇ The crust that includes continents is called continental crust and is about 35.4 to 70 km (22 to 43.4 mi) thick. It consists mostly of rocks, such as granites and granodiorites, that are rich in silica and aluminum, with minor amounts of iron, magnesium, calcium, sodium, and potassium. ◇ The crust that includes ocean floors is called oceanic crust and is about 4.8 to 9.7 km (3 to 6 mi) thick. It has a similar composition to that of continental crust, but has higher concentrations of iron, magnesium, and calcium and is denser than continental crust. The predominant type of rock in oceanic crust is basalt.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

crust definition

In geology, the outermost layer of the Earth. It overlies the mantle.

Note: The crust includes the continents and the ocean bottom and is generally estimated to be about five to twenty-five miles thick.
Note: The crust is made from relatively lightweight rocks that floated to the surface when the Earth was molten early in its history.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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