/strof"oyd, stroh"foyd/ , n. Geom.
a plane curve generated by the loci of points p and pprime; on a straight line that intersects the y-axis at a point n and the minus x-axis at a fixed point q, such that pn = npprime; = on, as on changes, where o is the origin. Equation: y 2 = x 2 ( x + a )/( a - x ).
[ 1875-80; stróph ( os ) twine + -OID, modeled on F strophoïde ]