xylem

[ zahy-luhm, -lem ]

noun

, Botany.

1. a compound tissue in vascular plants that helps provide support and that conducts water and nutrients upward from the roots, consisting of tracheids, vessels, parenchyma cells, and woody fibers.

xylem

/ ˈzaɪləm; -lɛm /

noun

1. a plant tissue that conducts water and mineral salts from the roots to all other parts, provides mechanical support, and forms the wood of trees and shrubs. It is of two types (protoxylem and metaxylem), both of which are made up mainly of vessels and tracheids See also protoxylem metaxylem

xylem

/ zī′ləm /

1. A tissue in vascular plants that carries water and dissolved minerals from the roots and provides support for softer tissues. Xylem consists of several different types of cells: fibers for support, parenchyma for storage, and tracheary elements for the transport of water. The tracheary elements are arranged as long tubes through which columns of water are raised. In a tree trunk, the innermost part of the wood is dead but structurally strong xylem, while the outer part consists of living xylem, and beyond it, layers of cambium and phloem.
2. See more at cambiumCompare phloem

xylem

1. The system of vessels that transports water in a plant. ( See phloem .)

Word History and Origins

Origin of xylem¹

1870–75; < German, equivalent to Greek xýl ( on ) wood + -ēma ( phloem )

Word History and Origins

Origin of xylem¹

C19: from Greek xulon wood

Example Sentences

Cicadas are strange in that they feed on the tree’s xylem, which carry water and some nutrients.

From Seattle Times

Cicadas drink 300 times their body weight in xylem, a nutrient-poor plant sap, each day.

From New York Times

The remnants of the xylem and phloem — tubules that transport water, sugars and nutrients throughout living leaves — somehow become a root.

From New York Times

Most sap-sucking insects drill into a nutrient-dense plant tissue called phloem, but spittlebugs specialize in the much more dilute sap from another tissue, xylem.

From Science Magazine

More research is needed, but the scientists suspect it's due to the bugs' preference for sap from the xylem, which is the main water-carrying structure of the plant.

From Science Daily