ˈepəˌnastē noun
( -es )
Etymology: International Scientific Vocabulary epi- + -nasty; originally formed as German epinastie
: a nastic movement by which a plant part is bent outward and often downward (as in the unfolding of a flower petal)
the opening of the bud is brought about by … epinasty — B.S.Meyer & D.B.Anderson