| chalk |
a soft whitish calcite a pure flat white with little reflectance methamphetamine: an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant a piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces write, draw, or trace with chalk
출처: wordnet.princeton.edu/perl/webwn
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| chalk |
(chalk) (chawk) [L. calx] 1. a natural calcium carbonate; the amorphous remains of minute marine organisms deposited on the sea bottom and decomposed by the action of acids and heat. Used as a polishing agent in dentistry and frequently as an ingredient in dentifrices. 2. any of various other substances physically resembling calcium carbonate.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| chalkitis |
(chal
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| chalk |
Chalk is a soft, white type of limestone (a sedimentary rock). It consists mostly of calcium carbonate (CaCO 3 ) from ancient, microscopic, single-celled marine invertebrate shells. This type of rock is very porous, soft (a hardness of 3 on the Mohs scale), and crumbly. The chalk used to draw with is actually gypsum (calcium sulfate, CaSO 4 -2H 2 O) CHAMPSOSAUR (pronounced CHAMP-so-SAWRS) Champsosaurs were early lizard-like reptiles that lived in water. (Subclass Diapsida, Order Choristodera)
출처: www.enchantedlearning.com/subjects/dinosaurs/gloss...
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| chalk |
A variety of limestone composed of shells of microscopic oceanic organisms.
출처: imnh.isu.edu/digitalatlas/glossary/letter.asp
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