the tendency of some plant organs to take a transverse position to the line of action of an outside stimulus.
Origin of diatropism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a response of plants or parts of plants to an external stimulus by growing at right angles to the direction of the stimulus
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