[ 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

tra·che·i·dal [truh-kee-i-dl, trey-kee-ahyd-l] /trəˈki ɪ dl, ˌtreɪ kiˈaɪd l/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for tracheid

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

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

Science 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.