Rul"er (r&udd;l"&etilde;r), n. 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. 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).
Parallel ruler. See under Parallel.