'myelin' definitions:

Definition of 'myelin'

noun

A white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers [syn: myelin, myeline, medulla]

Definition of 'myelin'

From: GCIDE

myelin \my"e*lin\, myeline \my"e*line\, n. [Gr. myelo`s marrow.] (Physiol. Chem.) (a) A soft white substance constituting the medullary sheaths of nerve fibers, and composed mainly of cholesterin, lecithin, cerebrin, protein, and some fat. (b) One of a group of phosphorized principles occurring in nerve tissue, both in the brain and nerve fibers. [1913 Webster]

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