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med·ul·lat·ed 'med-əl-.āt-əd, 'mej-ə-.lāt- adj
1) MYELINATED
2) having a medulla used of fibers other than nerve fibers
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nerve fibre any nerve fibre that has a sheath of myelin surrounding and insulating its axon.
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med·ul·lat·ed (medґə-lāt″əd) myelinated.Medical dictionary. 2011.