WordReference Random House Unabridged Dictionary of American English © 2025
med′ullary sheath′, 
    1. Botanya narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants.
    2. AnatomySee myelin sheath. 
    • 1840–50

'medullary sheath' also found in these entries (note: many are not synonyms or translations):
medullation

Forum discussions with the word(s) "medullary sheath" in the title:


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