conchoid of Nicomedes conchoid of Nicomedes /ˈkɑnkoɪd ʌv ˌnaɪkɒˈmiːdiːz/

noun

1. The conchoid of a straight line with respect to a point not on the line.  ( conchoid of Nicomedes )
   the conchoid of a straight line with respect to a point not on the line.