n.1. A soft compact calcite, CaCO3, with varying amounts of silica, quartz, feldspar, or other mineral impurities, generally gray-white or yellow-white and derived chiefly from fossil seashells.
2. a. A piece of chalk or chalklike substance in crayon form, used for marking on a blackboard or other surface.
b. Games A small cube of chalk used in rubbing the tip of a billiard or pool cue to increase its friction with the cue ball.
3. A mark made with chalk.
4. Chiefly British A score or tally.
tr.v. chalked,
chalk·ing,
chalks 1. To mark, draw, or write with chalk: chalked my name on the blackboard.
2. To rub or cover with chalk, as the tip of a billiard cue.
3. To make pale; whiten.
4. To treat (soil, for example) with chalk.