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.
Sorry, no etymologies found.