Webster
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Webster’s Revised Unabridged Dictionary · 1913

Lemniscata

Lem′nis·ca′ta (lĕm′nĭs·kā′tȧ), Lem·nis′cate (lĕm·nĭs′kāt), n. [L. lemniscatus adorned with ribbons, fr. lemniscus a ribbon hanging down, Gr. λημνίσκος.] (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.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.