nastic movement

(ˈnæstɪk)

(Botany) a response of plant parts that is independent of the direction of the external stimulus, such as the opening of buds caused by an alteration in light intensity

[C19 nastic, from Greek nastos close-packed, from nassein to press down]

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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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