from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The state of being sensitive to or irritated by light.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. sensitivity to, or irritation caused by light

from the GNU version of the Collaborative International Dictionary of English

  • n. A motile condition in plants resulting from exposure to light.
  • n. An irritable condition of protoplasm, resulting in movement, due to a certain intensity of light.

from The Century Dictionary and Cyclopedia

  • n. In botany, a term proposed by Sachs for the peculiar condition in which the protoplasm is capable of exhibiting irritability induced in certain plant-organs by exposure to light of a certain intensity.


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