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The Collaborative International Dictionary

myelin \my"e*lin\, myeline \my"e*line\, n. [Gr. myelo`s marrow.] (Physiol. Chem.)

  1. A soft white substance constituting the medullary sheaths of nerve fibers, and composed mainly of cholesterin, lecithin, cerebrin, protein, and some fat.

  2. One of a group of phosphorized principles occurring in nerve tissue, both in the brain and nerve fibers.


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