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The Collaborative International Dictionary of English v.0.48 (gcide)

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.
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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}.
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{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.
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Chalk \Chalk\, v. t. [imp. & p. p. {Chalked}; p. pr. & vb. n.
{Chalking}.]
1. To rub or mark with chalk.
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2. To manure with chalk, as land. --Morimer.
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3. To make white, as with chalk; to make pale; to bleach.
--Tennyson.
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Let a bleak paleness chalk the door. --Herbert.
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{To chalk out}, to sketch with, or as with, chalk; to
outline; to indicate; to plan. [Colloq.] "I shall pursue
the plan I have chalked out." --Burke.
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