Etymology
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myelin (n.)

also myeline, "soft material found in nerve tissues," 1867, from German Myelin (Virchow, 1854), from Greek myelos "marrow; the brain, innermost part," a word of unknown origin. Related: Myelitic.

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Definitions of myelin

myelin (n.)
a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers;
Synonyms: myeline / medulla
From wordnet.princeton.edu