Etymology
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lecithin (n.)

fatty substance found in the yolks of eggs (among other places), 1853, from French lécithine (coined 1850 by French pharmacist Theodore N. Gobley), from Greek lekithos "egg yolk," + chemical suffix -ine (2). Greek lekithos is of unknown origin; Beekes writes that, "Because of the suffixes and the meaning, the word is clearly of Pre-Greek origin." Related: Lecithinase.

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Definitions of lecithin

lecithin (n.)
a yellow phospholipid essential for the metabolism of fats; found in egg yolk and in many plant and animal cells; used commercially as an emulsifier;
From wordnet.princeton.edu