Webster's English Dictionary

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lecithin

lec.i.thin \'les-*-th*n\ n [ISV, fr. Gk lekithos yolk of an egg] : any of 
   several waxy hygroscopic phosphatides widely distributed in anima ls and 
   plants that form colloidal solutions in water and have emulsifying, 
   wetting, and antioxidant properties; also : a mixture of or substance rich 
   in lecithins