From The Collaborative International Dictionary of English v.0.48 [gcide]:
myelin \my"e*lin\, myeline \my"e*line\, noun [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.
From WordNet (r) 3.0 (2006) [wn]:
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