Definitions

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

  • n. The supporting and water-conducting tissue of vascular plants, consisting primarily of tracheids and vessels; woody tissue.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A vascular tissue in land plants primarily responsible for the distribution of water and minerals taken up by the roots; also the primary component of wood.

from the GNU version of the Collaborative International Dictionary of English

  • n. That portion of a fibrovascular bundle which has developed, or will develop, into wood cells; -- distinguished from phloëm.

from The Century Dictionary and Cyclopedia

  • n. In botany, that part of a fibrovascular bundle which contains ducts or tracheids—that is, the woody part, as distinguished from the phloëm, or bast part. Compare phloëm. See protoxylem, leptoxylem.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels

Etymologies

German, from Greek xulon, wood.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From German Xylem, from Ancient Greek ξύλον (ksulon, "wood"). (Wiktionary)

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