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The Collaborative International Dictionary of English v.0.48:

Nyctitropic \Nyc`ti*trop"ic\, a. [From Gr. ny`x, nykto`s, night
   + ? turning.] (Bot.)
   Turning or bending at night into special positions.
   [1913 Webster]

   Note: Nyctitropic movements of plants usually consist in a
         folding or drooping of the leaves, the advantage being
         in lessening the radiation of heat.
         [1913 Webster]