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Definition of: lecithin
Our photo definition of lecithin 
(les′ə·thin) noun Biochem.
A brownish–yellow, waxy, phosphorized fat contained in the cell tissue of many plants and animals, especially the brain, nerves, egg yolk, and protoplasm: used in medicine as a tonic and nutrient. [<Gk. lekithos an egg's yolk + -IN]
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