Lemniscate

noun

1. The locus of the point in which the straight through the center and the projection of a point of a circle on a fixed tangent are cut by the perpendicular from this point to the diameter from the contact point.
2. In mathematics, related to the lemniscate of Bernoulli.
3. In ichthyology, having a hyaline or transparent appearance and ribbonlike form; of or relating to the Lemniscati: as, a lemniscate fish.
4. In mathematics:
5. The locus of the point at which the tangent to an equilateral hyperbola meets the perpendicular let fall upon it from the center: a curve invented by James Bernoulli.