Bible Dictionaries
Tautochrone
Webster's Dictionary
(n.) A curved line, such that a heavy body, descending along it by the action of gravity, will always arrive at the lowest point in the same time, wherever in the curve it may begin to fall; as, an inverted cycloid with its base horizontal is a tautochrone.
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Bibliography Information
Webster, Noah. Entry for 'Tautochrone'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/t/tautochrone.html. 1828.