- Enter a word for the dictionary definition.
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]