Nyctitropism
Pronunciation : Nyc*tit"ro*pism, n. [From Gr. ,
Part of Speech : night
Definition : Defn: The tendency of certain plant organs, as leaves, to assume special "sleeping" positions or make curvatures under the influence of darkness. It is well illustrated in the leaflets of clover and other leguminous plants.
+ to turn.] (Plant Physiol.)
Source : Webster's Unabridged Dictionary, 1913