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ruler

[roo-ler]
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noun
  1. a person who rules or governs; sovereign.
  2. Also rule. a strip of wood, metal, or other material having a straight edge and usually marked off in inches or centimeters, used for drawing lines, measuring, etc.
  3. a person or thing that rules paper, wood, etc.
  4. Astrology. the planet primarily associated with any sign of the zodiac or any house of the horoscope: The ruler of Aries is Mars. The ruler of Taurus is Venus.

Origin of ruler

Middle English word dating back to 1325–75; see origin at rule, -er1
Related formssub·rul·er, nounun·der·rul·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for ruler

ruler

noun
  1. a person who rules or commands
  2. Also called: rule a strip of wood, metal, or other material, having straight edges graduated usually in millimetres or inches, used for measuring and drawing straight lines
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ruler

n.

"one who rules," late 14c., agent noun from rule (v.). Meaning "instrument used for making straight lines" is c.1400 (cf. rule (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper