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bundle sheath

noun, Botany.
a layer of cells in plant leaves and stems that surrounds a vascular bundle. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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bundle sheath  
A layer or region of compactly arranged cells surrounding a vascular bundle in a plant. The bundle sheaths regulate the movement of substances between the vascular tissue and the parenchyma and, in leaves, protect the vascular tissue from exposure to air.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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