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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 my·e·lin, my·e·line n.   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.
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From: WordNet (r) 2.0

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