- (geometry) a plane curve consisting of two branches situated about a line to which they are asymptotic,
so that a line from a fixed point (the pole) intersecting both branches is of constant
length between asymptote and either branch. Equation: (x – a)²( x² + y²) = b² x² where a is the distance between the pole and a vertical asymptote and b is the length of the constant segment
to comment on this word.