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1. Oxford American Dictionary

   geotropism

   • IPA[ˌjēəˈträˌpiz(ə)m]

   美式

   • n.
     the growth of the parts of plants with respect to the force of gravity. The upward growth of plant shoots is an instance of negative geotropism; the downward growth of roots is positive geotropism.

   • noun: geotropism

2. • 相關詞

   positive geotropism

   • n.
     the tendency of roots to grow downwards.

   Oxford Dictionary

   negative geotropism

   • n.
     the tendency of plant stems and other parts to grow upwards.

   Oxford Dictionary

   positive geotropism

   • n.
     the tendency of roots to grow downward.

   Oxford American Dictionary

3. • 更多解釋

   geotropism

   • IPA[ˌdʒiːəʊˈtrəʊpɪz(ə)m]

   英式

   • n.
     the growth of the parts of plants in response to the force of gravity. The upward growth of ...

   Oxford Dictionary