Learn how to say Geotropic correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word geotropism:
[mass noun] Botany
the growth of the parts of plants in response 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.
Pronunciation: /dʒiːə(ʊ)ˈtrəʊpɪk, -ˈtrɒpɪk/