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1. 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
    
2. A soft whitish calcite
    
3. A pure flat white with little reflectance
    
4. [informal] 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
   - methamphetamine, methamphetamine hydrochloride, Methedrine, meth [informal], deoxyephedrine, crank [informal], glass [informal], ice [informal], shabu [Asia, informal], trash [informal], gak [informal], crystal meth

1. Write, draw, or trace with chalk

Derived forms: chalks, chalked, chalking

Type of: amphetamine, calcite, controlled substance, draw, pep pill [informal], speed [informal], upper [informal], white, whiteness, writing implement

Encyclopedia: Chalk, John