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bundle sheath

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noun Botany.
  1. a layer of cells in plant leaves and stems that surrounds a vascular bundle.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for bundle sheath

Historical Examples

  • On account of this bundle-sheath the bundles are called fibro-vascular bundles.

    A Handbook of Some South Indian Grasses

    Rai Bahadur K. Ranga Achariyar

  • In the vascular bundles of the ground tissue the bundle-sheath is rather prominent and the phloëm portion is well developed.

    A Handbook of Some South Indian Grasses

    Rai Bahadur K. Ranga Achariyar


bundle sheath in Science

bundle sheath

  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.