nastic(redirected from Nastic movements)
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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.]
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)]