unmyelinated

[ uhn-mahy-uh-luh-ney-tid ]
/ ʌnˈmaɪ ə ləˌneɪ tɪd /

adjective Anatomy.

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

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Origin of unmyelinated

First recorded in 1915–20; un-1 + myelinated
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Medical definitions for unmyelinated

unmyelinated
[ ŭn-mīə-lĭ-nā′tĭd ]

adj.

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.