bundle sheath


noun Botany.

a layer of cells in plant leaves and stems that surrounds a vascular bundle.

Example sentences from the Web for bundle sheath

Scientific definitions for bundle sheath

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.