EXAMPLES | WORD ORIGIN noun . Biology a soft, white, fatty material in the membrane of Schwann cells and certain neuroglial cells: the substance of the myelin sheath.
my·e·line [ mahy- uh-leen] /ˈmaɪ əˌlin/
Origin of myelin
First recorded in
-in 2 Related forms my·e·lin·ic, adjective
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for myelin Contemporary Examples of myelin Historical Examples of myelin
Alveolar cells commonly contain fat-droplets and, less frequently,
Between the neurolemma and the axis cylinder is the medullated sheath, composed of a fatty substance known as
myelin. British Dictionary definitions for myelin myelin myeline ( ˈmaɪɪˌliːn) noun a white tissue forming an insulating sheath ( myelin sheath) around certain nerve fibres. Damage to the myelin sheath causes neurological disease, as in multiple sclerosis Derived Forms myelinic, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for myelin n.
myeline, "soft material found in nerve tissues," 1867, from German Myelin (1854), from Greek myelos "marrow; the brain, innermost part," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
n. A white fatty material composed chiefly of alternating layers of lipids and lipoproteins that encloses the axons of myelinated nerve fibers. Droplets of lipid formed during autolysis and postmortem decomposition. Related forms my′e•lin ′ic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
A whitish, fatty substance that forms a sheath around many vertebrate nerve fibers. Myelin insulates the nerves and permits the rapid transmission of nerve impulses. The white matter of the brain is composed of nerve fibers covered in myelin.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.