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

  • adj. Of, relating to, or characterized by the tendency in plant parts to move in a direction determined by an internal stimulus, as an increased rate of cellular growth on one surface or side of the plant part.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Relates to the response of a plant to a stimulus that does not depend on the location of the stimulus.


Greek nastos, pressed close (from nassein, to press) + -ic.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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