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[mahy-uh-lin] /ˈmaɪ ə lɪn/
noun, Biology
a soft, white, fatty material in the membrane of Schwann cells and certain neuroglial cells: the substance of the myelin sheath.
Also, myeline
[mahy-uh-leen] /ˈmaɪ əˌlin/ (Show IPA)
1865-70; myel- + -in2
Related forms
myelinic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for myelinic


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 myelinic



also 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
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myelinic in Medicine

myelin my·e·lin (mī'ə-lĭn) or my·e·line (-lĭn, -lēn')

  1. A white fatty material composed chiefly of alternating layers of lipids and lipoproteins that encloses the axons of myelinated nerve fibers.

  2. Droplets of lipid formed during autolysis and postmortem decomposition.

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.
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myelinic in Science
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for myelinic


white, insulating sheath composed of fatty materials, protein, and water on the axon of many nerve fibres. The myelin sheath is deposited by Schwann cells in layers surrounding the nerve fibres of the central and peripheral nervous systems of many organisms. The sheath is interrupted at intervals by gaps called nodes of Ranvier; this structure speeds nerve conduction, as impulses jump from node to node in a process known as saltatory conduction.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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