[med-l-ey-shuhn, mej-uh-ley-]
noun Biology.
the formation of a medullary sheath about a nerve fiber.

medull(a) + -ation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Medullation of these fibers begins about the time of birth and continues until puberty.
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