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ing with a sprocket wheel. -- Pitch line, or Pitch circle (Gearing), an ideal line, in a toothed gear or rack, bearing such a relation to a corresponding line in another gear, with which the former works, that the two lines will have a common velocity as in rolling contact; it usually cuts the teeth at about the middl…

a gun mounted on a pivot or revolving carriage, so as to turn in any direction. -- Pivot tooth (Dentistry), an artificial crown attached to the root of a natural tooth by a pin or peg.

A form of dentine which shows sinuous lines of structure in a transverse section of the tooth.

To act as, or convey, a poison. Tooth that poisons if it bite. Shak.

An anterior molar tooth which has replaced a deciduous molar. See Tooth.

The fang of a tooth.

form meaning five, five times, fivefold; as, quinquefid, five-cleft; quinquedentate, five-toothed.

Five-toothed; as, a quinquedentate leaf.

ld tight by the use of a small stick of wood twisted around. -- Rack rail (Railroads), a toothed rack, laid as a rail, to afford a hold for teeth on the driving wheel of locomotive for climbing steep gradients, as in ascending a mountain. -- Rack saw, a saw having wide teeth. -- Rack stick, the stick used in a rack…

A toothed machine drawn by a horse, -- used for collecting hay or grain; a horserake.

h. See in the Vocabulary. -- Nettle rash. See Urticaria. -- Rose rash. See Roseola. -- Tooth rash. See Red-gum.

ined by violence; plunder; prey; raven. "Fowls of ravyne." Chaucer. Though Nature, red in tooth and claw With ravine, shrieked against his creed. Tennyson.

An eruption of red pimples upon the face, neck, and arms, in early infancy; tooth rash; strophulus. Good.

rring to the whole body. There are very few treasuries of relics in Italy that have not a tooth or a bone of this saint. Addison. Thy relics, Rowe, to this fair urn we trust, And sacred place by Dryden's awful dust. Pope.

; retribution; now, specifically, the return of evil for evil; e.g., an eye for an eye, a tooth for a tooth. God . . . takes what is done to others as done to himself, and by promise obloges himself to full retaliation. Calamy.

port; that from which anything proceeds as if by growth or development; as, the root of a tooth, a nail, a cancer, and the like. Specifically:

A small toothed wheel used by engravers to roll over a plate in order to order to produce rows of dots.

r or moisture. -- Rubber dam (Dentistry), a shield of thin sheet rubber clasped around a tooth to exclude saliva from the tooth.

more nearly allied to the rays. The flattened and much elongated snout has a row of stout toothlike structures inserted along each edge, forming a sawlike organ with which it mutilates or kills its prey.

rrowing, and many long, slender, prehensile oral tentacles. It includes Dentalium, or the tooth shells, and other similar shells. Called also Prosopocephala, and Solenoconcha.