(1):
(n.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common limestone.
(2):
(n.) Finely prepared chalk, used as a drawing implement; also, by extension, a compound, as of clay and black lead, or the like, used in the same manner. See Crayon.
(3):
(v. t.) To make white, as with chalk; to make pale; to bleach.
(4):
(v. t.) To manure with chalk, as land.
(5):
(v. t.) To rub or mark with chalk.