geotropism

n.
The growth of a living organism in response to gravity, as the downward growth of plant roots.

geotropic ge'o·tro'pic (jē'ə-trō'pĭk, -trŏp'ĭk) adj.
geotropically ge'o·tro'pi·cal·ly adv.

A tendency of growth or movement toward or away from the earth; the influence of gravity on growth.

The movement of plant parts in response to gravity. Positive geotropism causes roots to grow downward; negative geotropism causes stems to grow upward.

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The noun has one meaning:

Meaning #1: an orienting response to gravity

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