ruler

Meanings

1. 1
   noun

   A (usually rigid), flat, rectangular measuring or drawing device with graduations in units of measurement; a straightedge with markings.

   1914, Ernest Bramah, Max Carrados Take this ruler. […] I want you to measure the glass of the lamp.

2. 2
   noun

   A person who rules or governs; someone or something that exercises dominion or controlling power over others.

   The carcharhinids are unquestionably the rulers of the seas, because of their abundance, their strength and speed, and their unchallenged position as the number one predators in the marine ecosystem.

3. 3
   noun

   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

4. 4
   noun

   a person who rules or commands

5. 5
   verb

   To beat with a ruler (as a traditional school punishment).

Etymology

From Middle English reuler; equivalent to rule + -er.