Etymology

ruler

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Today it means: A (usually rigid), flat, rectangular measuring or drawing device with graduations in units of measurement; a straightedge with markings. Full definition →

Middle English reuler
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The story

  1. Middle English · inherited fromreuler
  2. English todayruler

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

Etymology from Wiktionary, CC BY-SA 4.0.