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nyctitropic
From 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]

