An instrument for cutting or dividing substances, as wood, iron, etc, consisting of a thin blade, or plate, of steel, with a series of sharp teeth on the edge, which remove successive portions of the material by cutting and tearing.
Saw is frequently used adjectively, or as the first part of a compound. Band saw, Crosscut saw, etc. See Band, Crosscut, etc. Circular saw, a disk of steel with saw teeth upon its periphery, and revolved on an arbor. Saw bench, a bench or table with a flat top for for sawing, especially with a circular saw which projects above the table. Saw file, a three-cornered file, such as is used for sharpening saw teeth. Saw frame, the frame or sash in a sawmill, in which the saw, or gang of saws, is held. Saw gate, a saw frame. Saw gin, the form of cotton gin invented by Eli Whitney, in which the cotton fibres are drawn, by the teeth, of a set of revolving circular saws, through a wire grating which is too fine for the seeds to pass.
(Science: botany) Saw grass, the marsh titmouse (Parus palustris); so named from its call note. Scroll saw, a ribbon of steel with saw teeth upon one edge, stretched in a frame and adapted for sawing curved outlines; also, a machine in which such a saw is worked by foot or power
Origin: OE. Sawe, AS. Sage; akin to D. Zaag, G. Sage, OHG. Sega, saga, Dan. Sav, sw. Sag, Icel. Sog, L. Secare to cut, securis ax, secula sickle. Cf. Scythe, Sickle, Section, Sedge.

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