nonmyelinated


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un·my·e·li·nat·ed

(ŭn-mī'ĕ-li-nāt'ed),
Denoting nerve fibers (axons) lacking a myelin sheath.

nonmyelinated

(nŏn-mī′ĕ-lĭ-nāt″ĕd) [″ + Gr. myelos, marrow]
Containing no myelin.