noun Botany.
a specialized tissue in the roots and stems of vascular plants, composed of a single layer of modified parenchyma cells forming the inner boundary of the cortex.

1880–85; endo- + -dermis

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World English Dictionary
endodermis (ˌɛndəʊˈdɜːmɪs)
botany the specialized innermost layer of cortex in roots and some stems, which controls the passage of water and dissolved substances between the cortex and stele
[C19: from New Latin, from endo- + Greek derma skin]

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American Heritage
Science Dictionary
endodermis   (ěn'də-dûr'mĭs)  Pronunciation Key 
The innermost layer of the cortex that forms a sheath around the vascular tissue of roots and some stems. In the roots the endodermis helps regulate the intake of water and minerals into the vascular tissues from the cortex.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for endodermis
The vascular cylinder, or stele, consists of the cells inside the endodermis.
As the stele increases in diameter, the cortex, pericycle and endodermis are lost.
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