Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of or relating to a movement of a plant that is in response to an external stimulus but is in a direction independent of the direction of the stimulus, as in the diurnal movement of leaves.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

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

[Greek nastos, pressed close (from nassein, to press) + –ic.]

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