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tracheary element

[ trākē-ĕr′ē ]
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Either of two types of elongated cells, tracheids and vessel elements, found in xylem in vascular plants. Tracheids are found in all vascular plants, but vessel elements are unique to angiosperms. Both kinds of cells die at maturity, but their lignified cell walls remain as the conduits through which water is carried in the xylem. See more at tracheid vessel element.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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