D defs.my
Entry 1 sense Webster, 1913

Lecithin

/lĕs'-əth-ən/ · Lec·i·thin · IPA /ˈlɛs.ə.θɪn/
01 n. A complex, nitrogenous phosphorized substance widely distributed through the animal body, and especially conspicuous in the brain and nerve…
  1. 1.
    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.(Physiol. Chem.)