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[trey-kee-id] /ˈtreɪ ki ɪd/
noun, Botany.
an elongated, tapering xylem cell having lignified, pitted, intact walls, adapted for conduction and support.
Compare vessel (def 5).
Origin of tracheid
First recorded in 1870-75; trache(a) + -id3
Related forms
[truh-kee-i-dl, trey-kee-ahyd-l] /trəˈki ɪ dl, ˌtreɪ kiˈaɪd l/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for tracheid
Historical Examples
  • As a rule buckling of a tracheid begins at the bordered pits which form places of least resistance in the walls.

British Dictionary definitions for tracheid


(botany) an element of xylem tissue consisting of an elongated lignified cell with tapering ends and large pits
Derived Forms
tracheidal (trəˈkiːɪdəl; ˌtreɪkɪˈaɪdəl) adjective
Word Origin
C19: from trachea (in the sense: a vessel in a plant) + -id²
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
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tracheid in Science
  (trā'kē-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 © 2002. Published by Houghton Mifflin. All rights reserved.
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