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medullary sheath

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noun
Botany. a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants.
Anatomy. myelin sheath.
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Origin of medullary sheath

First recorded in 1840–50

Words nearby medullary sheath

Med.Sc.D., medulla, medulla oblongata, medullary, medullary ray, medullary sheath, medullated, medullation, medulloblastoma, medusa, medusafish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use medullary sheath in a sentence

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

    Social Life in the Insect World|J. H. Fabre

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

    Wood and Forest|William Noyes

British Dictionary definitions for medullary sheath

medullary sheath
noun
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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