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From Longman Dictionary of Contemporary English
Related topics: Plants
transpirationtran‧spi‧ra‧tion /ˌtrænspəˈreɪʃən/ noun [uncountable]  technicalHBP the process of passing water through the surface of a plant’s leavesrespiration
Examples from the Corpus
transpirationThey have abandoned leaves to reduce loss of water by transpiration, and their stems are swollen with stored water.More than half of this disappears through evaporation or transpiration through plants.Once in the xylem, the salts are carried passively in the transpiration stream to the upper parts of the plant.Apart from mysterious perfumes, the transpiration of this unusual liquid is the most frequently reported phenomenon.Plant roots in the peats and estuarine sediments concentrate uranium in cell walls, especially in regions associated with transpiration processes.
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