nastic

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nas·tic

 (năs′tĭk)
adj.
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.

[Greek nastos, pressed close (from nassein, to press) + -ic.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

nas•tic

(ˈnæs tɪk)

adj.
of or pertaining to movement in a plant part in response to cellular changes in growth or pressure.
[1900–10; < Greek nast(ós) pressed close, stamped down (v. adj. of nássein to press)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Nastic movements are those made in response to some stimulus but are not oriented relative to the direction of the stimulus.
Using one of the search engines on the Internet, such as Google, Yahoo!, Ask.com, and MSN Live Search, find more information by searching for these words or phrases: plant growth and development, photoperiod, phytochrome, plant biological clocks, short-day plants, long-day plants, day neutral plants, plant hormones, auxin, IAA, parthenocarpic fruit, apical, gibberellins, bioassay, cytokinins, abscisic acid, ethylene, postharvest physiology, flowering hormone, tropisms, and nastic movements.