Ruler
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 05:07的版本 （建立内容为“Category:etymology == wiktionary == [https://en.wiktionary.org/wiki/ruler ref] From [https://en.wikipedia.org/wiki/Middle_English Middle English] reuler; equ…”的新页面）
wiktionary
From Middle English reuler; equivalent to rule + -er.
etymonline
ruler (n.)
late 14c., "one who rules or governs," especially in reference to superior or sovereign authority, agent noun from rule (v.). The meaning "instrument used for guiding a pen, etc. in making straight lines" is by c. 1400 (compare rule (n.), the older word for this).
