[ trey-kee-id ]
/ ˈtreɪ ki ɪd /
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noun Botany.
an elongated, tapering xylem cell having lignified, pitted, intact walls, adapted for conduction and support.Compare vessel (def. 5).
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Origin of tracheid

First recorded in 1870–75; trache(a) + -id3


tra·che·i·dal [truh-kee-i-dl, trey-kee-ahyd-l], /trəˈki ɪ dl, ˌtreɪ kiˈaɪd l/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use tracheid in a sentence

  • As a rule buckling of a tracheid begins at the bordered pits which form places of least resistance in the walls.

  • One to two large, simple pits to each tracheid on the radial walls of the cells of the pith ray.

    Wood and Forest|William Noyes
  • One or two large pits to each tracheid on the radial walls of each cell of the pith ray.

    Wood and Forest|William Noyes

British Dictionary definitions for tracheid



/ (ˈtreɪkɪɪd) /

botany an element of xylem tissue consisting of an elongated lignified cell with tapering ends and large pits

Derived forms of tracheid

tracheidal (trəˈkiːɪdəl, ˌtreɪkɪˈaɪdəl), adjective

Word Origin for tracheid

C19: from trachea (in the sense: a vessel in a plant) + -id ²
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

Scientific definitions for tracheid

[ trākē-ĭd, -kēd′ ]

An elongated, water-conducting cell in xylem, one of the two kinds of tracheary elements. Tracheids have pits where the cell wall is modified into a thin membrane, across which water flows from tracheid to tracheid. The cells die when mature, leaving only their lignified cell walls. Tracheids are found in all vascular plants. Compare vessel element.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.