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

 

phototropism

 noun
noun
BrE BrE//ˌfəʊtəʊˈtrəʊpɪzəm//
 
; NAmE NAmE//ˌfoʊtoʊˈtroʊpɪzəm//
 
[uncountable](biology)
 
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the action of a plant turning towards or away from light
See the Oxford Advanced American Dictionary entry: phototropism