2 definitions found From The Collaborative International Dictionary of English v.0.48 [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] From WordNet (r) 2.0 [wn]: myeline n : a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers [syn: {myelin}, {medulla}]
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