Found 2 items, similar to myelin.
English → English (WordNet) Definition: myelin myelin n : a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers [syn: myeline, medulla]
English → English (gcide) Definition: myelin 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]