Etymology
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geotropism (n.)

"growth downward," 1874, from geo- "earth" + -trope "a turn, direction" (from PIE root *trep- "to turn"), translating German Geotropismus (1868), which was coined in 1868 by German botanist Albert Bernhard Frank. Related: Geotropic.

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Definitions of geotropism

geotropism (n.)
an orienting response to gravity;
From wordnet.princeton.edu