Tract″rix (?), n. [NL. See Tractor.] (Geom.) 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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.