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The Collaborative International Dictionary of English v.0.48 (gcide)

Lemniscata \Lem`nis*ca"ta\ (l[e^]m`n[i^]s*k[=a]"t[.a]),
Lemniscate \Lem*nis"cate\ (l[e^]m*n[i^]s"k[asl]t), n. [L.
lemniscatus adorned with ribbons, fr. lemniscus a ribbon
hanging down, Gr. lhmni`skos.] (Geom.)
A curve in the form of the figure 8, with both parts
symmetrical, generated by the point in which a tangent to an
equilateral hyperbola meets the perpendicular on it drawn
from the center.
[1913 Webster]

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