gravitropism

noun
gra·​vit·​ro·​pism | \grə-ˈvi-trə-ˌpi-zəm \

Definition of gravitropism 

: a tropism (as of plant roots or shoots) in which gravity is the stimulus : geotropism No matter what the orientation of a seed for instance, the roots will always grow down to the soil. This has a special name, gravitropism, and is movement in response to the force of gravity …— Jeanette Mackay

First Known Use of gravitropism

1976, in the meaning defined above

History and Etymology for gravitropism

gravi(ty) + -tropism

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The first known use of gravitropism was in 1976

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