Crust Definition

krŭst
crusted, crusting, crusts
noun
crusts
The hard, crisp outer part of bread.
Webster's New World
A piece of bread consisting mostly of the hard outer portion.
American Heritage
A piece of this.
Webster's New World
Any dry, hard piece of bread.
Webster's New World
The pastry shell of a pie.
Webster's New World
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verb
crusted, crusting, crusts

To cover with a crust.

Wiktionary
To cover or become covered with a crust.
Webster's New World
To form or harden into a crust.
Webster's New World
To harden into a crust.
American Heritage Medicine
other
The solid, outermost layer of the Earth, lying above the mantle. &diamf3; 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. &diamf3; 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.
American Heritage Science
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Other Word Forms of Crust

Noun

Singular:
crust
Plural:
crusts

Origin of Crust

  • Latin crusta (“hard outer covering”) via Anglo-Norman and Old French cruste, from Proto-Indo-European *krus-to (“that which has been hardened”), from *kreus (“to form a crust, begin to freeze”), related to Old Norse hroðr (“scurf”), Old English hruse (“earth”), Old High German hrosa (“crust, ice”), Latvian kruwesis (“frozen mud”), Ancient Greek κρύος (kruos, “frost, icy cold”), κρύσταλλος (krustallos, “crystal, ice”), Avestan [script?] (xruzdra-, “hard”), Sanskrit क्रुड् (kruḍ, “thicken, make hard”)

    From Wiktionary

  • Middle English cruste from Old French crouste from Latin crusta kreus- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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