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