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  1. Oxford American Dictionary

    heliotropism

    • IPA[ˌhēlēəˈtrōpizəm]

    美式

    • n.
      the directional growth of a plant in response to sunlight.；the tendency of an animal to move toward light.

    • noun: heliotropism

    • 更多解釋

    heliotropism

    • IPA[ˌhiːlɪə(ʊ)ˈtrəʊpɪz(ə)m]

    英式

    • n.
      the directional growth of a plant in response to sunlight.

    Oxford Dictionary