tracheid

tra·che·id

T0299500 (trā′kē-ĭd, -kēd′)n. 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.

tracheid

(ˈtreɪkɪɪd) or

tracheide

n (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

tra•che•id

(ˈtreɪ ki ɪd)

n. an elongated, tapering xylem cell having woody, pitted, intact walls, adapted for conduction and support. Compare vessel (def. 4). [1870–75]

Thesaurus

Noun

tracheid - long tubular cell peculiar to xylemvascular tissue - tissue that conducts water and nutrients through the plant body in higher plantsxylem - the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels

Tracheid

tracheid

[′trā·kē·əd] (botany) An elongate, spindle-shaped xylem cell, lacking protoplasm at maturity, and having secondary walls laid in various thicknesses and patterns over the primary wall.

Tracheid

a dead lignified plant cell that functions in water conduction. Tracheids are found in the xylem of all higher plants except certain angiosperms, such as cereals and sedges, in which the water-conducting function is performed by vessels, or tracheae. Tracheids are usually polygonal in cross section; their walls have annular, spiral, or scalene thickenings or rimmed pores. The cells range in length from fractions of a millimeter to 3–5 mm (pine, larch) and even 10 mm (agave). In the process of evolution, tracheids developed into fibrous tracheids with limited water-conducting ability and into specialized mechanical elements known as libriform fibers.

tracheid

Fig. 299 Tracheid . General structure.

tracheid

any of several structures found in XYLEM, consisting of a cell which is long, slender and tapered with heavily lignified walls surrounding an empty lumen, the protoplasm having died.

The wall thickening can be continuous with BORDERED PITS, or else arranged in a variety of patterns, annular, helical and ladder-like. See Fig. 299 . Tracheids form the water-conducting tissues of GYMNOSPERMS, but are found also amongst the xylem vessels of ANGIOSPERMS

tracheid

tra·che·id

tracheid

tracheide

tra•che•id

Tracheid

tracheid

Tracheid

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Words related to tracheid

noun long tubular cell peculiar to xylem

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