grey drake
noun
1- Brit. the greyish gravid female of certain mayflies〈英〉受孕雌蜉蝣成虫。
1.1
- Genus Ephemera, family Ephemeridae.蜉蝣属, 蜉蝣科。
1.2
- an artificial fishing fly that imitates this模仿蜉蝣成虫的假鱼饵。