Definition of transpiration noun from the Oxford Advanced Learner's Dictionary

 

transpiration

 noun
noun
BrE BrE//ˌtrænspɪˈreɪʃn//
 
; NAmE NAmE//ˌtrænspɪˈreɪʃn//
 
[uncountable](biology)
 
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the process of water passing out from the surface of a plant or leaf compare perspiration
See the Oxford Advanced American Dictionary entry: transpiration