- tautochrone
[tautochrone 词源字典]
- "A curve upon which a body moving under gravity or another force will reach the lowest point (or some other fixed point) in the same amount of time, regardless of the point from which it starts", Late 18th cent.; earliest use found in Oliver Goldsmith (?1728–1774), author. From French tautochrone from post-classical Latin tautochronus, adjective from tauto- + ancient Greek χρόνος time.[tautochrone etymology, tautochrone origin, 英语词源]