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CHALK

Definition:

[noun] a soft whitish calcite
[noun] a pure flat white with little reflectance
[noun] amphetamine used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
Synonyms: methamphetamine, methamphetamine hydrochloride, Methedrine, meth, deoxyephedrine, chicken feed, crank, glass, ice, shabu, trash
[noun] a piece of chalk (or similar substance) used for writing on blackboards or other surfaces
[verb] write, draw, or trace with chalk