epinasty Bot.
(ˈɛpɪnæstɪ)
[f. epi- + Gr. ναστός (f. νάσσειν to squeeze close) + -y3.]
(See quot.)
| 1880 C. & F. Darwin Movem. Pl. 5 The term epinasty is now often used in Germany, and implies that the upper surface of an organ grows more quickly than the lower surface, and thus causes it to bend downwards. 1882 Vines Sachs' Bot. 859 Geotropism will act in the former in opposition to epinasty. |