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Definition of: geotropism
(jē·ot′rə·piz′əm) noun Biol.
A tendency exhibited by organisms, especially the roots of growing plants, to turn toward the center of the earth: distinguished from apogeotropism. Compare GEOTAXIS.
—ge·o·trop·ic (jē′ə·trop′ik) adjective
—ge′o·trop′i·cal·ly adverb
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