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medullary sheath

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

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
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Word History and Origins

Origin of medullary sheath1

First recorded in 1840–50

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medullary raymedullated

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