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 for Guide block
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.
        [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]

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