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From The Collaborative International Dictionary of English v.0.48:
Guide \Guide\, n. [OE. giae, F. guide, It. guida. See Guide, v. t.] 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. [1913 Webster] 2. One who, or that which, directs another in his conduct or course of life; a director; a regulator. [1913 Webster] He will be our guide, even unto death. --Ps. xlviii. 14. [1913 Webster] 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. [1913 Webster] 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. --Farrow. [1913 Webster] 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. [1913 Webster]