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Nyctitropic
Nyctitropic Nyc`ti*trop"ic, a. [From Gr. ?, ?, night + ?
turning.] (Bot.)
Turning or bending at night into special positions.
Note: Nyctitropic movements of plants usually consist in a
folding or drooping of the leaves, the advantage being
in lessening the radiation of heat.
Meaning of Nyctitropic from wikipedia