chalk
has definitions from the fields of color,geology,medicine,pharmacology
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[ noun ] (geology) a soft whitish calcite
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[ noun ] (medicine,pharmacology) amphetamine used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
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[ noun ] Last name, frequency rank in the U.S. is 12083
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[ noun ] a piece of chalk (or similar substance) used for writing on blackboards or other surfaces
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