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]

	

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

	

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