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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 tractrix
 等切麵曲線; 曳物線

From: Webster's Revised Unabridged Dictionary (1913)

 Tract·rix n.  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.