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medullary sheath

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.
Origin
1840-1850
1840-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
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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