英语词汇“xylem”的英英意思、用法、释义、翻译、读音、例句、短语、词组、英语词典-本地帮

单词

xylem

释义

xylem Bot.|ˈzaɪlɛm|
[mod. (Nägeli in Ger.) f. Gr. ξύλον wood: cf. phloem.]
Collective name for the cells, vessels, and fibres forming the harder portion of the fibrovascular tissue; the wood, as a tissue of the plant-body. Also attrib.
1875Bennett & Dyer tr. Sachs' Bot. 94 The different forms of tissue of a differentiated fibro-vascular bundle may be classified into two groups, which Nägeli calls the Phloëm- (Bast) and Xylem- (Wood) portion of the bundle... The xylem-portion of the fibro-vascular bundle has mostly a strong tendency to thicken its cell-forms.Ibid. 95 These horizontal elements..may be..designated as rays; within the xylem they are called xylem-rays, within the phloëm, phloëm-rays.1894D. H. Scott Struct. Bot. i. Flowering Pl. 56 The woody character of the cell-walls of the xylem is due to the presence of a substance called lignine.

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