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A type of water-conducting cell in the xylem which lacks perforations in the cell wall.
- ‘Lignins occur in great quantity in the secondary cell walls of fibres, xylem vessels and tracheids.’
- ‘Vessel elements, tracheids, fibres, sieve tube elements, sieve cells, and parenchyma cells are the major components of vascular tissue.’
- ‘This method allows the cavitation resistance of the metastable liquid water in the lumen of tracheids in conifer sapwood sections to be estimated.’
- ‘The lack of lignin in lateral walls shifts the function of ‘pipe walls’ to the turgid parenchyma paving the tracheid.’
- ‘Tissues external to the xylem were removed because of the presence of large resin ducts which could release materials that would obstruct water flow through the xylem tracheids.’
Late 19th century: from German Tracheide, from medieval Latin trachea (see trachea).
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