Definition of phototropic adjective from the Oxford Advanced Learner's Dictionary

 

phototropic

 adjective
adjective
BrE BrE//ˌfəʊtəʊˈtrɒpɪk//
 
; NAmE NAmE//ˌfoʊtoʊˈtrɑːpɪk//
 
(biology)
 
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(of a plant or how it grows) turning towards or away from light