Guide, n.
 1. A person who leads or directs another in his way or course, as in a strange land; one who exhibits points of interest to strangers; a conductor; also, that which guides; a guidebook.
 2. One who, or that which, directs another in his conduct or course of life; a director; a regulator.
    He will be our guide, even unto death.   --Ps. xlviii. 14.
 3. Any contrivance, especially one having a directing edge, surface, or channel, for giving direction to the motion of anything, as water, an instrument, or part of a machine, or for directing the hand or eye, as of an operator; as: (a) Water Wheels A blade or channel for directing the flow of water to the wheel buckets. (b) Surgery A grooved director for a probe or knife. (c) Printing A strip or device to direct the compositor's eye to the line of copy he is setting.
 4. Mil. A noncommissioned officer or soldier placed on the directing flank of each subdivision of a column of troops, or at the end of a line, to mark the pivots, formations, marches, and alignments in tactics.
 Guide bar Mach., the part of a steam engine on which the crosshead slides, and by which the motion of the piston rod is kept parallel to the cylinder, being a substitute for the parallel motion; -- called also guide, and slide bar.
 Guide block Steam Engine, a block attached in to the crosshead to work in contact with the guide bar.
 Guide meridian. Surveying See under Meridian.
 Guide pile Engin., a pile driven to mark a place, as a point to work to.
 Guide pulley Mach., a pulley for directing or changing the line of motion of belt; an idler. --Knight.
 Guide rail Railroads, an additional rail, between the others, gripped by horizontal driving wheels on the locomotive, as a means of propulsion on steep gradients.

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