xylem

[ zahy-luhm, -lem ]

/ ˈzaɪ ləm, -lɛm /

noun Botany.

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.

Origin of xylem

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

Words nearby xylem

XX, XXX, XXXX, XXY syndrome, xylan, xylem, xylem ray, xylene, xylic acid, xylidine, xylitol

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for xylem

The larger vascular bundles consist of xylem and phloëm surrounded by a bundle sheath of a single layer of cells.
A Handbook of Some South Indian Grasses|Rai Bahadur K. Ranga Achariyar
The larger bundles are normal in every way, while in the smaller ones the xylem elements are considerably reduced.
A Handbook of Some South Indian Grasses|Rai Bahadur K. Ranga Achariyar
The arrangement of the xylem and the phloëm is different from that of the stem.
A Handbook of Some South Indian Grasses|Rai Bahadur K. Ranga Achariyar
Just above the xylem there is a group of large and small thin-walled cells.
A Handbook of Some South Indian Grasses|Rai Bahadur K. Ranga Achariyar

The number of xylem groups is fairly large and the development of the xylem is from the pericycle towards the centre of the stele.
A Handbook of Some South Indian Grasses|Rai Bahadur K. Ranga Achariyar

British Dictionary definitions for xylem

xylem

/ (ˈzaɪləm, -lɛm) /

noun

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 tracheidsSee also protoxylem, metaxylem

Word Origin for xylem

C19: from Greek xulon wood

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Cultural definitions for xylem

xylem

[ (zeye-luhm) ]

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

Scientific definitions for xylem

xylem

[ zī′ləm ]

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. See more at cambium capillary action. Compare phloem.

单词	xylem
释义	xylem [ zahy-luhm, -lem ] / ˈzaɪ ləm, -lɛm / noun Botany. 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. Origin of xylem 1870–75; <German, equivalent to Greek xýl(on) wood + -ēma (see phloem) Words nearby xylem XX, XXX, XXXX, XXY syndrome, xylan, xylem, xylem ray, xylene, xylic acid, xylidine, xylitol Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for xylem The larger vascular bundles consist of xylem and phloëm surrounded by a bundle sheath of a single layer of cells. A Handbook of Some South Indian Grasses\|Rai Bahadur K. Ranga Achariyar The larger bundles are normal in every way, while in the smaller ones the xylem elements are considerably reduced. A Handbook of Some South Indian Grasses\|Rai Bahadur K. Ranga Achariyar The arrangement of the xylem and the phloëm is different from that of the stem. A Handbook of Some South Indian Grasses\|Rai Bahadur K. Ranga Achariyar Just above the xylem there is a group of large and small thin-walled cells. A Handbook of Some South Indian Grasses\|Rai Bahadur K. Ranga Achariyar The number of xylem groups is fairly large and the development of the xylem is from the pericycle towards the centre of the stele. A Handbook of Some South Indian Grasses\|Rai Bahadur K. Ranga Achariyar British Dictionary definitions for xylem xylem / (ˈzaɪləm, -lɛm) / noun 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 tracheidsSee also protoxylem, metaxylem Word Origin for xylem C19: from Greek xulon wood Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cultural definitions for xylem xylem [ (zeye-luhm) ] The system of vessels that transports water in a plant. (See phloem.) The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Scientific definitions for xylem xylem [ zī′ləm ] 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. See more at cambium capillary action. Compare phloem. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
随便看	billy budd billy club billycock billy goat billy no-mates arpent arpino arquebus arr. arracacha arrack arrah arraign arraignment arran arrange arranged marriage arrangement arrangements arrant arras arrau array arrayal arrearage