chalk

Chalk is defined as a soft limestone that is white, gray or yellow or something made of this substance.

(noun)

An example of chalk is what the teacher uses to write on the blackboard.

The definition of chalk is made or drawn with soft white, gray or yellow limestone.

(adjective)

An example of chalk used as an adjective is in the phrase "chalk drawing," which means a drawing made with this substance.

See chalk in Webster's New World College Dictionary

noun

a white, gray, or yellowish limestone that is soft, porous, and easily pulverized, composed almost entirely of calcite from minute sea shells
any substance like chalk in color, texture, etc.
a piece of chalk, often colored, used for drawing, writing on a blackboard, etc.
a mark or line made with chalk
Brit. a score or tally, as in a game or as of credit given

Origin: ME < OE cealc < L calx, lime, limestone: see calcium

adjective

made or drawn with chalk
☆ Horse Racing, Slang
1. favored to win, place, or show
2. betting on favorites only

transitive verb

Brit. to treat with chalk; lime or fertilize (soil)
to rub or smear with chalk; specif., to rub chalk on the tip of (a billiard cue)
to make pale
to write, draw, or mark with chalk

intransitive verb

to become chalky or powdery, as a painted surface

See chalk in American Heritage Dictionary 4

noun

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.
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.
A mark made with chalk.
Chiefly British A score or tally.