extine Bot.
(ˈɛkstɪn, -taɪn)
[f. L. ext- (in extimus most outward, f. ex-) + -ine1.]
The outer membrane of the pollen grain. Also exine.
| 1835 Lindley Introd. Bot. (1848) I. 358 The shell of the pollen-grain..has been ascertained to consist..of two or even three membranes, of which the outer (extine) is thicker than the inner (intine). 1882 Vines Sachs' Bot. 505 The contents [of pollen grains] enclosed by an extine and intine, divide into two cells. |