A syntractrix is a
:
References
* George Salmon (1879). "A Treatise on the Higher Plane Curves: Intended as a Sequel to A Treatise on Conic Sections". Published by Hodges, Foster, and Figgis. Page 290. [http://books.google.com/books?id=Vv43AAAAMAAJ&pg=PA289&dq=Syntractrix&ie=ISO-8859-1#PPA290,M1]
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syntractrix — … Useful english dictionary
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