nastic movement

noun

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

Word Origin for nastic movement

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