ruler

[roo-ler]
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:
1325–75; Middle English; see rule, -er1

subruler, noun
underruler, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ruler (ˈruːlə)
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Their subjects made donations to the temples to curry favor-both with the gods
  and with the local ruler.
To ascertain this easily, insert a clean, wood ruler into the pan before
  cooking and measure how far up the mixture comes.
What begins as an attempt to build a fancy scale or ruler can end up being the
  basis for a major discovery.
Grab a ruler and measure your physical copy of the letterhead.
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