medullary-sheath

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:
1840–50

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Collins
World English Dictionary
medullary sheath
 
n
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 10th Edition
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American Heritage
Medical Dictionary

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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