from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The hard outer portion or surface area of bread.
  • n. A piece of bread consisting mostly of the hard outer portion.
  • n. A piece of bread that has become hard and dry.
  • n. A pastry shell, as of a pie or tart.
  • n. A hard crisp covering or surface: snow with a firm crust.
  • n. A hard deposit formed on the interior of a wine bottle as the wine matures.
  • n. Geology The exterior portion of the earth that lies above the Mohorovičić discontinuity.
  • n. Geology The outermost solid layer of a planet or moon.
  • n. The hard outer covering or integument of certain plants and animals, such as lichens and crustaceans.
  • n. Pathology An outer layer or coating formed by the drying of a bodily exudate such as pus or blood; a scab.
  • n. Informal Insolence; audacity; gall.
  • transitive v. To cover with a crust.
  • transitive v. To form into a crust.
  • intransitive v. To become covered with a crust.
  • intransitive v. To harden into a crust.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A more solid, dense or hard layer on a surface or boundary.
  • n. The external layer of most types of bread.
  • n. Outer layer composed of pastry
  • n. Bread foundation of pizza
  • n. The outermost layer of the lithosphere of the Earth.
  • n. Nerve, gall.
  • n. crust punk (a subgenre of punk music)
  • v. To cover with a crust.
  • v. To form a crust.

from the GNU version of the Collaborative International Dictionary of English

  • n. The hard external coat or covering of anything; the hard exterior surface or outer shell; an incrustation.
  • n.
  • n. The hard exterior or surface of bread, in distinction from the soft part or crumb; or a piece of bread grown dry or hard.
  • n. The cover or case of a pie, in distinction from the soft contents.
  • n. The dough, or mass of doughy paste, cooked with a potpie; -- also called dumpling.
  • n. The exterior portion of the earth, formerly universally supposed to inclose a molten interior.
  • n. The shell of crabs, lobsters, etc.
  • n. A hard mass, made up of dried secretions blood, or pus, occurring upon the surface of the body.
  • n. An incrustation on the interior of wine bottles, the result of the ripening of the wine; a deposit of tartar, etc. See Beeswing.
  • intransitive v. To gather or contract into a hard crust; to become incrusted.
  • transitive v. To cover with a crust; to cover or line with an incrustation; to incrust.

from The Century Dictionary and Cyclopedia

  • To cover with a crust or hard exterior portion or coating; overspread with anything resembling a crust; incrust.
  • To coat or line with concretions. See crust, n., 3.
  • To thicken or contract into a hard covering; concrete or freeze, as superficial matter.
  • To crust-hunt.
  • n. A hard external portion, of comparative thinness, forming a sort of coating over the softer interior part; any hard outer coat or coating: as, the crust of frozen snow; the crust of a loaf of bread; a thin crust of politeness.
  • n. Specifically In geology: The exterior portion of the earth; that part of the earth which is accessible to examination.
  • n. The solid portion of the earth, as opposed to its fused interior, many geologists and physicists believing that the interior of the earth must be in a more or less fluid condition.
  • n. Matter collected or concreted into a solid body; an incrustation; specifically, a deposit from wine, as it ripens, collected on the interior of bottles, etc., and consisting of tartar and coloring matter.
  • n. A piece of an outer coating or incrustation; specifically, an external or a dried and hard piece of bread.
  • n. In zoology, a shell; a test; the chitinous or other hard covering of various animals, as crustaceans and insects.
  • n. In anatomy and physiology, a coat or covering harder or denser than that which is covered; a pellicle; a crusta: as, the buffy coat or crust of inflammatory blood; the crust of a tooth.
  • n. The part of the hoof of a horse to which the shoe is fastened.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the trait of being rude and impertinent; inclined to take liberties
  • v. form a crust or form into a crust
  • n. the outer layer of the Earth
  • n. a hard outer layer that covers something


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English cruste, from Old French crouste, from Latin crūsta.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin crusta ("hard outer covering") via Anglo-Norman and Old French cruste.



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  • the top hard layer of snow

    January 18, 2013