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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

    • 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

    • 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