Bible Dictionaries
Tractrix
Webster's Dictionary
(n.) A curve such that the part of the tangent between the point of tangency and a given straight line is constant; - so called because it was conceived as described by the motion of one end of a tangent line as the other end was drawn along the given line.
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Bibliography Information
Webster, Noah. Entry for 'Tractrix'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/t/tractrix.html. 1828.