from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The science that deals with the activating effects of light on living organisms.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The study of the activating effects of light on living organisms
from the GNU version of the Collaborative International Dictionary of English
- n. The relation of light to the movements of plants and their organs; the study of the phenomena of curvatures induced by the stimulus of light.
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