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medullary sheath

American  

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.

medullary sheath British  

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

Etymology

Origin of medullary sheath

First recorded in 1840–50

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.