medullation: Meaning and Definition of

med•ul•la•tion

Pronunciation: (med"l-ā'shun, mej"u-lā'-), [key]
— n. Biol.
  1. the formation of a medullary sheath about a nerve fiber.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.