English dictionary
tractrix
/'tr/&/ktr/I/ks/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
-
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.
Source: webster1913