1The greyish gravid female of certain mayflies.
- Genus Ephemera, family Ephemeridae
More example sentences
- Green and grey drakes were hatching profusely, right along with Hexagenias - all huge, elegant, juicy trout meals.
- The gray drakes were hatching in the shallows, and fish - some big - were rising steadily.
- The grey drakes are in the family Siphlonuridae and can be found in faster water.