What is "myeline"

myelin \my"e*lin\, myeline \my"e*line\, n. [Gr. myelo`s marrow.] (Physiol. Chem.)

1. A soft white substance constituting the medullary sheaths of nerve fibers, and composed mainly of cholesterin, lecithin, cerebrin, protein, and some fat.

2. One of a group of phosphorized principles occurring in nerve tissue, both in the brain and nerve fibers.

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