Hypertext Webster Gateway: "myelin"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Myelin \My"e*lin\, n. [Gr. ? marrow.] (Physiol. Chem.)
(a) A soft white substance constituting the medullary sheats
of nerve fibers, and composed mainly of cholesterin,
lecithin, cerebrin, albumin, 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) 1.7 (wn)
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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