• synonyms


  1. botany (of a plant movement) occurring in response to an external stimulus
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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

Examples from the Web for paratonic

Historical Examples of paratonic

  • They are mostly reflex or paratonic, and due to external stimuli.

    The Wonders of Life

    Ernst Haeckel

  • The change in torsion is, moreover, determined in reference to the paratonic action of incident geotropic stimulus.

  • I find that this autonomous movement becomes modified or even arrested by the paratonic effect of light.

  • I have already referred to the distinction that is made between nastic and paratonic movements.