from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of or relating to paratonia.

from The Century Dictionary and Cyclopedia

  • Arresting or retarding plant movement or growth: a term proposed by Sachs, in 1865, to characterize the variations in intensity of light which produce the movements of waking and sleeping (nyctitropism) in plants, in contradistinction to heliotropism.
  • Due to the influence of an external stimulus, such as light, gravity, or humidity: thus used by Strassburger in the phrase paratonic movements, opposed by him to autonomic movements.


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