[mahy-uh-lin] /ˈmaɪ ə lɪn/

noun, Biology.
a soft, white, fatty material in the membrane of Schwann cells and certain neuroglial cells: the substance of the .
a white tissue forming an insulating sheath (myelin sheath) around certain nerve fibres. Damage to the myelin sheath causes neurological disease, as in multiple sclerosis

also myeline, “soft material found in nerve tissues,” 1867, from German Myelin (1854), from Greek myelos “marrow; the brain, innermost part,” of unknown origin.

myelin my·e·lin (mī’ə-lĭn) or my·e·line (-lĭn, -lēn’)

my’e·lin’ic adj.
A whitish, fatty substance that forms a sheath around many vertebrate nerve fibers. Myelin insulates the nerves and permits the rapid transmission of nerve impulses. The white matter of the brain is composed of nerve fibers covered in myelin.


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  • Myelinated

    [mahy-uh-luh-ney-tid] /ˈmaɪ ə ləˌneɪ tɪd/ adjective, Anatomy. 1. (of a nerve) having a ; medullated. /ˈmaɪɪlɪˌneɪtɪd/ adjective 1. (of a nerve fibre) having a myelin sheath myelinated my·e·li·nat·ed (mī’ə-lə-nā’tĭd) adj. Having a myelin sheath.

  • Myelinated fiber

    myelinated fiber n. An axon enveloped by a myelin sheath. Also called medullated fiber.

  • Myelination

    [mahy-uh-luh-ney-shuh n] /ˌmaɪ ə ləˈneɪ ʃən/ noun, Anatomy. 1. the formation of a . myelination my·e·li·na·tion (mī’ə-lə-nā’shən) or my·e·li·ni·za·tion (mī’ə-lə-nĭ-zā’shən) n. The acquisition, development, or formation of a myelin sheath around a nerve fiber.

  • Myelinolysis

    myelinolysis my·e·li·nol·y·sis (mī’ə-lə-nŏl’ĭ-sĭs) n. Dissolution of the myelin sheaths of nerve fibers.

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