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1. Oxford Dictionary

   phototropism

   • IPA[ˌfəʊtə(ʊ)ˈtrəʊpɪz(ə)m]

   英式

   • n.
     the orientation of a plant or other organism in response to light, either towards the source of light (positive phototropism) or away from it (negative phototropism).

   • noun: phototropism