Xylem | definition of xylem by Medical dictionary
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xylem a woody plant tissue that is vascular in function, enabling the transport of water with dissolved minerals around the plant, usually in an upward direction. Xylem is characterized as having TRACHEIDS, xylem fibres for support, xylem PARENCHYMA and XYLEM VESSELS. The location of xylem is different in roots and stems, and the area of xylem is greatly increased by SECONDARY THICKENING.