Pronunciation: lem- ' nis-k ə t
Function: noun
Etymology: New Latin lemniscata, from feminine of Latin lemniscatus with hanging ribbons, from lemniscus
Date: circa 1781
: a figure-eight shaped curve whose equation in polar coordinates is ρ 2 = a 2 cos 2 θ or ρ 2 = a 2 sin 2 θ