medullary-ray

medullary ray

noun Botany.
(in the stems of woody plants) one of the vertical bands or plates of unspecialized tissue that radiate between the pith and the bark.
Also called pith ray.


Origin:
1820–30

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Collins
World English Dictionary
medullary ray
 
n
any of the sheets of conducting tissue that run radially through the vascular tissue of some higher plants

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

medullary ray n.
The center of the renal, cortical lobule, consisting of the ascending or descending limbs of the nephronic loop or of the collecting tubules. Also called Ferrein's pyramid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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