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单词	tracheid
释义	tracheid /ˈtreɪkɪɪd / noun Botany A type of water-conducting cell in the xylem which lacks perforations in the cell wall.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. 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).
随便看	primitivise primitivism primitivist primitivistic primitivization primitivize primly primmy primness primo primo ballerino primo basso primo buffo Primo de Rivera, Miguel primogeneous primogenial primogenious primogenit primogenital primogenitary primogenitive primogenitor primogenitrix primogeniture primogeniturist

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。