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The Collaborative International Dictionary
Chalk period

Chalk \Chalk\ (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See Calz, and Cawk.]

  1. (Min.) 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. (Fine Arts) 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.

    Black chalk, a mineral of a bluish color, of a slaty texture, and soiling the fingers when handled; a variety of argillaceous slate.

    By a long chalk, by a long way; by many degrees. [Slang]
    --Lowell.

    Chalk drawing (Fine Arts), a drawing made with crayons. See Crayon.

    Chalk formation. See Cretaceous formation, under Cretaceous.

    Chalk line, a cord rubbed with chalk, used for making straight lines on boards or other material, as a guide in cutting or in arranging work.

    Chalk mixture, a preparation of chalk, cinnamon, and sugar in gum water, much used in diarrheal affection, esp. of infants.

    Chalk period. (Geol.) See Cretaceous period, under Cretaceous.

    Chalk pit, a pit in which chalk is dug.

    Drawing chalk. See Crayon, n., 1.

    French chalk, steatite or soapstone, a soft magnesian mineral.

    Red chalk, an indurated clayey ocher containing iron, and used by painters and artificers; reddle.