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Nyctitropism
Nyctitropism Nyc*tit"ro*pism, n. [From Gr. ?, ?, night + ? to
turn.] (Plant Physiol.)
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.
Meaning of Nyctitropism from wikipedia
