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crust

1. Geology 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 Mohorovicić discontinuity
2. the dry covering of a skin sore or lesion; scab
3. Oenology a layer of acid potassium tartrate deposited by some wine, esp port, on the inside of the bottle
4. Biology the hard outer layer of such organisms as lichens and crustaceans

crust

The outermost solid layer of a terrestrial planet or a satellite, consisting of rock, ice, or a mixture of the two. See also Earth.

Crust

 

in plants, a complex of tissues on the surface of the stem and roots of woody plants, consisting of dead peridermal cells and parts of the bark. The crust forms as layers of periderm repeatedly form in the phloem. In the case of more or less concentric arrangement of peridermal layers, a ringed crust forms (as in mock orange and grapes); if the peridermal layers overlap, a scaly crust forms (as in oak). Depending on the nature of the depositing of crust, it falls from the surface of the tree in layers, ribbons, or scales. Crust usually forms late (in birch, pine, and oak when the tree is 25–35 years old); it protects the plant from excessive evaporation, sharp fluctuations of temperature, and other undesirable effects.

crust

[krəst]
(geology)
The outermost solid layer of the earth, mostly consisting of crystalline rock and extending no more than a few miles from the surface to the Mohorovičić discontinuity. Also known as earth crust.
(hydrology)
A hard layer of snow lying on top of a soft layer.
References in periodicals archive ?
Jane Brewin, marketing and stategy director, comments: "We were confident Hovis Crusty would be a huge success but the level of positive response from the consumer has been overwhelming
Joel Bachin and Luke Smith are part of the Crusty Demons team.
What type of set will the Crusty Demons be performing on?
Tickets for The Crusty Demons at Birmingham NIA are priced from pounds 25-35, plus booking and transaction fee, from 0871 945 6000 or online at www.
2 Stir the pesto through the soup with some seasoning, then ladle into bowls and serve with crusty brown bread, if you like.
The hearty Ploughman's Crusty Bite is made with a freshly baked mini-bloomer containing the finest mature white cheddar and ploughman's pickle set on a bed of lettuce, tomato and red onion.
Crusty Demons: Night of World Records; Wipeout Pulse; The Little Book of Smart; Archie and the Listers
Marvelous Market and others will tempt and please palates with everything from home-baked crusty breads and imported sauces and spreads, to farm-fresh produce.
He's been mourning Eddy musically ever since, and this particular act of closure involves the father completing several tracks the son was working on at the time of his death, as well as a few of Eddy's unreleased recordings and Billy Joe's own crusty, elegiac composition ``Fame.
The ideal printing for this garment is immediately soft and breathable, without crusty ink or cracked plastic to inhibit moisture release from the face of the fabric.
Stumbling through the crusty snow I follow the arrow.