1. • noun - a soft whitish calcite
   • noun - a pure flat white with little reflectance
   • noun - an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride
   • noun - 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
   • verb - write, draw, or trace with chalk
2. • A soft, compact calcite, CaCO 3, with varying amounts of silica, quartz, feldspar, or other mineral impurities, generally gray-white or yellowwhite and derived chiefly from fossil seashells.
   • A piece of chalk or chalklike substance in crayon form, used for marking on a blackboard or other surface.
   • A small cube of chalk used in rubbing the tip of a billiard or pool cue to increase its friction with the cue ball.
   • A mark made with chalk.
   • A score or tally.
   • To mark, draw, or write with chalk: chalked my name on the blackboard.
   • To rub or cover with chalk, as the tip of a billiard cue.
   • To make pale; whiten.
   • To treat (soil, for example) with chalk.
   • To earn or score: chalk up points.
   • To credit or ascribe: Chalk that up to experience.
3. • v - to mark with chalk (a soft limestone)

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