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.
Derivatives
geotropic
Pronunciation: /dʒiːə(ʊ)ˈtrəʊpɪk, -ˈtrɒpɪk/
adjective
Origin:
late 19th century: from geo- 'earth' + Greek tropē 'turning' + -ism
