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.
n 1: measuring stick consisting of a strip of wood or metal or
plastic with a straight edge that is used for drawing
straight lines and measuring lengths [syn: rule]
2: a person who rules or commands; "swayer of the universe"