1) Of movement in plants 2) Plant-movement descriptor 
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nastic 1. Plant movements in response to diffuse stimuli and to structural curvatures resulting from differential growth of opposite surfaces. 2. Relating to a response of a plant part; such as, growth or a loss of turgidity; to external stimuli that is independent of the direction of origin of such stimuli.3. The movement or growth of cellular ti...
of or showing sufficiently greater cellular force or growth on one side of an axis to change the form or position of the axis.