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British Dictionary definitions for nastic movement

nastic movement

noun
  1. 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
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Word Origin

C19 nastic, from Greek nastos close-packed, from nassein to press down
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012