nastic

adjective

nas·​tic ˈna-stik 

: of, relating to, or constituting a movement of a plant part caused by disproportionate growth or increase of turgor in one surface

Word History

Etymology

borrowed from German nastisch, generalized from the prefixed forms epinastisch "(of a plant) displaying outward and downward movement" and hyponastisch "displaying inward and upward movement" — more at epinasty

First Known Use

1906, in the meaning defined above