endodermis

American  

[en-doh-dur-mis] / ˌɛn doʊˈdɜr mɪs /

noun

Botany.

1. 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.

---

endodermis British  

/ ˌɛndəʊˈdɜːmɪs /

noun

1. 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

---

endodermis Scientific  

/ ĕn′də-dûr′mĭs /

1. 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.

---

Etymology

Origin of endodermis

First recorded in 1880–85; endo- + -dermis

Example Sentences

This control is exerted by a specialised layer of root tissue called the endodermis.

From Science Daily • Oct. 27, 2023

The endodermis contains a barrier to the movement of solutes and water that is made of lignin, the same material present in wood.

From Science Daily • Oct. 27, 2023

This ensures that only materials required by the root pass through the endodermis, while toxic substances and pathogens are generally excluded.

From Textbooks • Jun. 9, 2022

Everything inside the endodermis is the sclera, or vascular tissue.

From Textbooks • Jan. 1, 2015

The primary vascular bundles in a young conifer stem are collateral, and, like those of a Dicotyledon, they are arranged in a circle round a central pith and enclosed by a common endodermis.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" by Various