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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. FabreMS, 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
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