diaheliotropism Bot.
(daɪəhiːlɪˈɒtrəpɪz(ə)m)
[f. as prec.: see -ism.]
A tendency in leaves and organs of plants to grow transversely to the direction of incident light.
| 1880 C. & F. Darwin Movem. Pl. 5 Diaheliotropism may express a position more or less transverse to the light and induced by it. 1882 F. Darwin in Nature 27 Apr. 600 The power..called Transversal Heliotropismus by A. B. Frank, we have called diaheliotropism. |