| 释义 |
Definition of tracheid in English: tracheidnoun ˈtreɪkɪɪdˈtrākēid Botany A type of water-conducting cell in the xylem which lacks perforations in the cell wall. Example sentencesExamples - This method allows the cavitation resistance of the metastable liquid water in the lumen of tracheids in conifer sapwood sections to be estimated.
- 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.
- The lack of lignin in lateral walls shifts the function of ‘pipe walls’ to the turgid parenchyma paving the tracheid.
- 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.
Origin Late 19th century: from German Tracheide, from medieval Latin trachea (see trachea). Definition of tracheid in US English: tracheidnounˈtrākēid Botany A type of water-conducting cell in the xylem which lacks perforations in the cell wall. Example sentencesExamples - This method allows the cavitation resistance of the metastable liquid water in the lumen of tracheids in conifer sapwood sections to be estimated.
- Vessel elements, tracheids, fibres, sieve tube elements, sieve cells, and parenchyma cells are the major components of vascular tissue.
- Lignins occur in great quantity in the secondary cell walls of fibres, xylem vessels and tracheids.
- 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.
- The lack of lignin in lateral walls shifts the function of ‘pipe walls’ to the turgid parenchyma paving the tracheid.
Origin Late 19th century: from German Tracheide, from medieval Latin trachea (see trachea). |