Definition of lecithin
: any of several waxy hygroscopic phospholipids that are widely distributed in animals and plants, form colloidal solutions in water, and have emulsifying, wetting, and antioxidant properties
also
: a mixture of or substance rich in lecithins
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Merriam-Webster unabridged
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Time Traveler for lecithin
The first known use of lecithin was in 1861
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