One of the mysteries of the English language finally explained.
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 century; earliest use found in Oliver Goldsmith (?1728–1774), author. From French tautochrone from post-classical Latin tautochronus, adjective from tauto- + ancient Greek χρόνος time.
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