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 (trā′kē-ĭd, -kēd′)
A dead, water-conducting cell in the xylem of vascular plants, having tapered ends and pits in the cell wall but lacking the perforations found in a vessel element.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈtreɪkɪɪd) or


(Botany) botany an element of xylem tissue consisting of an elongated lignified cell with tapering ends and large pits
[C19: from trachea (in the sense: a vessel in a plant) + -id2]
tracheidal adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈtreɪ ki ɪd)

an elongated, tapering xylem cell having woody, pitted, intact walls, adapted for conduction and support. Compare vessel (def. 4).
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tracheid - long tubular cell peculiar to xylem
vascular tissue - tissue that conducts water and nutrients through the plant body in higher plants
xylem - the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Phloem (p) and a tracheid (t) are shown for one of the secondary bundles in Fig.
(34)) The use of TEM greatly extended LM observations, providing information on ultrastructural features of tracheid walls in the surface layers of boards where delignification from chemical pretreat-ment was greatest as well as of tracheid walls in deeper layers of cells, representing early to intermediate stages of delignification.
We assume that the cumulated AE energy is a more reliable measure for PLC than the AE number per se, because the hydraulic conductivity is proportional to the 4th power of the radius of a capillary (Hagen-Poiseuille equation) and tracheid diameters are variable within a wood specimen.
Dutilleul P, Herman M, Avella T (1998) Growth rate effects on correlations among ring width, wood density, and mean tracheid length in Norway spruce (Picea abies).
Cores were surfaced using a belt sander and progressively finer sandpaper, until tracheid walls were clearly visible under a stereo-zoom binocular microscope.
The adhesive must have traveled through ray and tracheid cells outside of the plane of the section.
The fibre tracheids and ray cells are intact at this stage .radial sections showed lumen of axial parenchyma and fiber tracheid cells filled with fungal hyphae [Fig 8,9].
Abbreviations used in the figures in this study: 1 = primary xylem; 2 = secondary xylem (wood); A = aperture of bordered pit; C = vascular cambium; M margo; MX = metaxylem; P = pith; PB = pit border; PH = phloem; PM = bordered pit membrane; PX = protoxylem; R = ray; S sclereids; T = torus; TR = tracheid; TY = tyloses; V = vessel member.
Vessels move more water efficiently than do tracheids because the perforations in their end walls are larger than the tracheid's pits and because the cross-sectional area is much greater.