1. [syn: myelin, myeline, medulla]
The Collaborative International Dictionary of English v.0.48:
myelin \my"e*lin\, myeline \my"e*line\, n. [Gr. myelo`s marrow.]
(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.
WordNet (r) 3.0 (2006):
n 1: a white fatty substance that forms a medullary sheath
around the axis cylinder of some nerve fibers [syn:
myelin, myeline, medulla]