\ˈkrəst \

Definition of crust 

1a : the hardened exterior or surface part of bread

b : a piece of this or of bread grown dry or hard

2a : the pastry shell of a pie : piecrust

b : the bready layer that forms the foundation of a pizza

3 : a hard or brittle external coat or covering: such as

a : a hard surface layer (as of soil or snow)

b : the outer part of a planet, moon, or asteroid composed essentially of crystalline rocks

c : a deposit built up on the interior surface of a wine bottle during long aging

d : an encrusting deposit (as of the eye) of dried secretions or exudate also : scab

4 : gall, nerve

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Other Words from crust

crust verb
crustal \ˈkrə-stᵊl \ adjective
crustless \ˈkrəs(t)-ləs \ adjective

Examples of crust in a Sentence

Her children prefer to eat their sandwiches with the crust cut off. a pie with flaky crust He likes pizza with thin crust.
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Recent Examples on the Web

Urban Ecology Center-Washington Park: Learn the basics of crust making or use your skills to help teach others. Elaine Rewolinski, Milwaukee Journal Sentinel, "Food and drink events: Cooking classes, wine tastings, more (Summer 2018 edition)," 6 July 2018 This traditional method sparkler offers notes of bread crust, pear, anise, tangy citrus and a clean finish with 11.5 percent alcohol. Michael Austin,, "Explore Michigan's diverse wine scene, one of the country's most exciting developing regions," 5 July 2018 In Yellowstone, this happens as magma seeps up from the mantle, a vast semi-solid region below the Earth’s crust. Kevin Davenport, idahostatesman, "Yellowstone's magma chamber is more powerful than we knew. Here's why studying it matters.," 3 July 2018 Bun types are matters of debate (Pizza Romana serves its as a panini on twin slabs of pizza crust). Garrett Snyder, Los Angeles Magazine, "Why Los Angeles Fell Head Over Heels for the Fried Chicken Sandwich," 25 June 2018 When sections of the Earth’s crust slip beneath or past one another, energy is released in the form of seismic waves. Annie Roth, National Geographic, "No, World Cup Fans Didn't Trigger an Earthquake. Here's Why.," 18 June 2018 Research suggests the magnitude 6.0 earthquake that rocked California wine country in 2014 may have been caused by an expansion of Earth's crust because of seasonally receding groundwater under the Napa and Sonoma valleys. Associated Pres,, "2014 Napa earthquake may be linked to groundwater changes, study says," 14 June 2018 These openings, or vents, in Earth’s crust allow hot ash, steam or even magma to erupt. Scientific American, "Volcanoes: Nature’s Way of Letting Off Steam," 4 June 2018 The ice cream has blackberry sauce swirls and bits of pie crust. Todd A. Price,, "Blue Bell brings back Southern Blackberry Cobbler ice cream," 4 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'crust.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of crust

14th century, in the meaning defined at sense 1a

History and Etymology for crust

Middle English crouste, cruste, borrowed from Anglo-French & Latin; Anglo-French cruste, crouste, going back to Latin crusta "hard coating or surface layer, shell of an arthropod or crustacean, mineral flake, stone slab used in paneling," perhaps, if going back to *krus-to- "something crushed or pounded into a hard layer," from a zero-grade nominal derivative of Indo-European *kreu̯s- "beat, crush, pound," whence also Old English hruse "earth, ground," Old High German roso, rosa "crust, layer of ice" (going back to Germanic *hrusōn-) — more at anacrusis

Note: The hypothetical base *krus-to- is suggested by Michiel de Vaan, Etymological Dictionary of Latin and the Other Italic Languages (Leiden: Brill, 2008), p. 147, though the older handbooks (Walde-Hoffman, Ernout-Meillet) tend to support a connection with Greek krýos "icy cold, frost" and other derivatives, going back to a presumed homonymous *krus- (see cryo-). As de Vaan points out, however, Latin crusta does not mean "ice." The original sense of the Germanic noun *hrusōn- is not certain. Greek krýstallos "ice, rock crystal" is almost certainly unrelated (see crystal entry 1).

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Phrases Related to crust

earn a/one's crust

the upper crust

Statistics for crust

Last Updated

15 Oct 2018

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Time Traveler for crust

The first known use of crust was in the 14th century

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More Definitions for crust



English Language Learners Definition of crust

: the hard outer surface of bread

: the outside part of a pie

: the bread that is used to make a pizza


\ˈkrəst \

Kids Definition of crust

1 : the hardened outside surface of bread

2 : a hard dry piece of bread

3 : the pastry cover of a pie

4 : a hard outer covering or surface layer a crust of snow

5 : the outer part of the earth


\ˈkrəst \

Medical Definition of crust 

2 : an encrusting deposit of serum, cellular debris, and bacteria present over or about lesions in some skin diseases (as impetigo or eczema)

Other Words from crust

crust verb

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