from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The innermost layer of the cortex that forms a sheath around the vascular tissue of roots and some stems.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. In a plant stem or root, a cylinder of cells the separates the outer cortex from the central core. The endodermis controls flow of water and minerals within the plant. In most plants, this tissue is restricted to the roots.
  • n. The deepest layer of the skin.

from the GNU version of the Collaborative International Dictionary of English

  • n. A layer of cells forming a kind of cuticle inside of the proper cortical layer, or surrounding an individual fibrovascular bundle.

from The Century Dictionary and Cyclopedia

  • n. In botany, the layer of modified parenchyma-cells which are united to form the sheath surrounding a fibrovascular bundle.


endo- + (epi)dermis.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From endo- (“within”) +‎ dermis (“skin”) (Wiktionary)



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  • (n): (plant anatomy) a thin layer of parenchyma cells in plant roots, just outside the vascular cylinder or stele, that regulates water flow. The endodermis consists of a single-celled ring which forms a selective barrier between the outer cortex and the inner pericycle tissue of the root. The endodermis regulates the molecules that can pass through cell walls into the tissues of the plant.

    January 4, 2009