Definition
dayfly
noun
- a mayfly, especially one that lives for only a day or a few hours in its adult form
Usage: also called ephemerid; chiefly used in entomology and fishing contexts
Examples
- The dayfly emerged from the water at dusk and had only hours to find a mate.
- Trout fishermen often use dayfly imitations as bait during the spring hatch.
- A dayfly's entire adult life may last less than a day.
- The river was covered with dayflies during the evening emergence.