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from the GNU version of the Collaborative International Dictionary of English

  • n. A disproportionately rapid growth of the upper surface of dorsiventral organs, such as leaves, through the stimulus of exposure to light.

from The Century Dictionary and Cyclopedia

  • n. In botany, an epinastic movement, or state of curvature observed in certain organs when exposed to intense light, due to a more active growth of the dorsal surface. Compare epinasty.


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