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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…

A man who digs chalk.

The state of being chalky.

A mass of chalk. As chalkstones . . . beaten in sunder. Isa. xxvii. 9.

Consisting of, or resembling, chalk; containing chalk; as, a chalky cliff; a chalky taste.

ubstance which absorbs and neutralizes acid fluid in the stomach and bowels, as magnesia, chalk, etc.; also a substance e. g., iodine) which acts on the absorbent vessels so as to reduce enlarged and indurated parts.

To adjoin behind; to be at the back of. A garden . . . with a vineyard backed. Shak. The chalk cliffs which back the beach. Huxley.

rface on which writing, drawing, or the working of mathematical problems can be done with chalk or crayons. It is much used in schools.

elonging to the family of Pycnodonts (thick teeth), whose remains occur in the oölite and chalk formations; toadstone; -- so named from a notion that it was originally formed in the head of a toad.

A thrust in fencing. To prove who gave the fairer butt, John shows the chalk on Robert's coat. Prior.

In the form of chalk or lime.

its crystallization, and thus distinguished from aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar.

The art of drawing with chalk.

To copy, as a drawing, by rubbing the back of it with red or black chalk, and then passing a blunt style or needle over the lines, so as to leave a tracing on the paper or other thing against which it is laid or held. [Writting also calque]

ter of natural springs. Combined with lime it constitutes limestone, or common marble and chalk. Plants imbibe it for their nutrition and growth, the carbon being retained and the oxygen given out. -- Carbonic oxide (Chem.), a colorless gas, CO, of a light odor, called more correctly carbon monoxide. It is almost the…

the oxide or carbonate of iron mixed with clay or sand. -- Clay marl, a whitish, smooth, chalky clay. -- Clay mill, a mill for mixing and tempering clay; a pug mill. -- Clay pit, a pit where clay is dug. -- Clay slate (Min.), argillaceous schist; argillite. -- Fatty clays, clays having a greasy feel; they are chem…

One of the hard beds of the lower chalk. Dana.

te particles, or to a fine powder; to pulverize; to triturate; to grind; as, to comminute chalk or bones; to comminute food with the teeth. Pennant. Comminuted fracture. See under Fracture.

An implement for drawing, made of clay and plumbago, or of some preparation of chalk, usually sold in small prisms or cylinders. Let no day pass over you . . . without giving some strokes of the pencil or the crayon. Dryden.

Having the qualities of chalk;abounding with chalk; chalky; as, cretaceous rocks and formations. See Chalk. Cretaceous acid, an old name for carbonic acid. -- Cretaceous formation (Geol.), the series of strata of various kinds, including beds of chalk, green sand, etc., formed in the Cretaceous period; -- called also…