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Definition of: apogeotropism
(ap′ə·jē·ot′rə·piz′əm) noun Bot.
The tendency to grow away from the earth, in opposition to gravitation, as plant stems and tree trunks; negative geotropism: also called ageotropism. [<APO- + GEOTROPISM-]
—ap·o·ge·o·trop·ic (ap′ə·jē′ə·trop′ik) adjective
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