Denoting nerve fibers (axons) lacking a myelin sheath. SYN: amyelinated, amyelinic, nonmedullated, nonmyelinated, unmedullated.
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un·my·elin·at·ed -'mī-ə-lə-.nāt-əd adj lacking a myelin sheath <\unmyelinated axons>
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un·my·eli·nat·ed (ən-miґə-lĭ-nāt″əd) not possessing a myelin sheath; said of a nerve fiber. Called also nonmedullated, nonmyelinated, and unmedullated.Medical dictionary. 2011.