| ruler | 1. One who rules; one who exercises sway or authority; a governor. "And he made him ruler over all the land." (Gen. Xii. 43) "A prince and ruler of the land." (Shak) 2. A straight or curved strip of wood, metal, etc, with a smooth edge, used for guiding a pen or pencil in drawing lines. Cf. Rule, 7 . Parallel ruler. See Parallel. Source: Websters Dictionary (01 Mar 1998) |
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| isometric ruler | A calibrated scale for eliminating distortion in the measurement of plane surfaces. (05 Mar 2000) |
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