crust

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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 classic literature ?
But hast thou truly nought but a dry crust about thee?
We had turned in the ice and sped upward toward the earth's crust.
Certainly," replied Barbicane; "as the internal fires became extinguished, and the incandescent matter concentrated itself, the lunar crust cooled.
When the cooling of its crust shall have made it uninhabitable.
the revolving of the bomb, against the external cooled crust, and so produced the solid shell of stone; and lastly, that the centrifugal force, by relieving the pressure in the more central parts of the bomb, allowed the heated vapours to expand their cells, thus forming the coarse cellular mass of the centre.
Oliver walked twenty miles that day; and all that time tasted nothing but the crust of dry bread, and a few draughts of water, which he begged at the cottage-doors by the road-side.
Pecan-cinnamon crusts provide the backdrop for a simple ganache filling topped with lots of red raspberries.
If you love the aroma of baking Italian bread wafting through your home, then the Rustic Crust Company has created some ready-made pizza crusts just for you.
Its launch follows research for the company which shows two thirds of children do not like crusts.
Due to hit UK shops next month, the soft-edged loaf is a response to demand from children who don't like sandwiches with crusts on them.
Keep the crusts in the freezer until you're ready to bake.
Atrophic rhinitis is a chronic nasal disease characterized by mucosal atrophy, resorption of the underlying bone, the formation of thick crusts, and a distinctive fetid odor.