adjective Anatomy.

pertaining to nerve fibers that are not covered with a myelin sheath.

Origin of unmyelinated

First recorded in 1915–20; un-1 + myelinated
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unmyelinated in Medicine




Lacking a myelin sheath. Used of a nerve fiber.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.