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Definition of Lecithin
1. Noun. 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.
Definition of Lecithin
1. n. A complex, nitrogenous phosphorized substance widely distributed through the animal body, and especially conspicuous in the brain and nerve tissue, in yolk of eggs, and in the white blood corpuscles.
Definition of Lecithin
1. any of a group of fatty substances found in plant and animal tissues [n -S]
Medical Definition of Lecithin
1.