01 n. One who rules; one who exercises sway or authority; a governor.
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1.
One who rules; one who exercises sway or authority; a governor.“And he made him ruler over all the land.” — Gen. xli. 43.“A prince and ruler of the land.” — Shak.
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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, n., 7 (a)<-- usu. marked with graduations so that it can be used to measure distances -->. See: Rule
Phrases & compounds
Parallel ruler —
See under Parallel.