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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.


(ˈnæs tɪk)

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.
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