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medullary sheath

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noun
  1. Botany. a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants.
  2. Anatomy. myelin sheath.
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Origin of medullary sheath

First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for medullary sheath

medullary sheath

noun
  1. anatomy a myelin layer surrounding and insulating certain nerve fibres
  2. a layer of thick-walled cells surrounding the pith of the stems of some higher plants
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
medullary sheath in Medicine

medullary sheath

n.
  1. myelin sheath
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.