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medullary sheath

Botany. a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants.
Anatomy. myelin sheath.
Origin of medullary sheath
First recorded in 1840-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for medullary sheath
Historical Examples
  • MS, medullary sheath, the dark, irregular ring just inside the bundles.

    Wood and Forest William Noyes
  • Each one of the perforations is the entrance to an oblique tunnel, which is bored in the medullary sheath of the twig.

British Dictionary definitions for medullary sheath

medullary sheath

(anatomy) a myelin layer surrounding and insulating certain nerve fibres
a layer of thick-walled cells surrounding the pith of the stems of some higher plants
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
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medullary sheath in Medicine

medullary sheath n.
See myelin sheath.

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