Try Our Apps


The saddest words

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. 2017.
Cite This Source
Examples from the Web for medullary sheath
Historical Examples
  • Each one of the perforations is the entrance to an oblique tunnel, which is bored in the medullary sheath of the twig.

  • MS, medullary sheath, the dark, irregular ring just inside the bundles.

    Wood and Forest William Noyes
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
Cite This Source
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.
Cite This Source

Word of the Day

Difficulty index for medullary sheath

Few English speakers likely know this word

Word Value for medullary

Scrabble Words With Friends

Nearby words for medullary sheath