a. Bot. [f. (by Darwin, 1880) Gr. ἀπό from + γῆ (in comb. γεο-) earth + τροπικ-ός turing.] Bending or turning away from the ground. (Said of leaves and other parts of plants.)
1880. Darwin, Movem. Plants, 189. When they [the rhizomes] were cultivated in water their tips turned upwards, and they became apogeotropic.
