- A neuropterous pest for the family members Ephemeridæ; the Ephemerina; an ephemerid; a day-fly. See the technical words, and cut under day-fly.
- In Great Britain, a neuropterous insect of the suborder Trichoptera, and especially of the family Phryganeidæ, as Sialis lutaria; the caddis-fly.
- An artificial fly made in imitation associated with the May-fly.
Sentence for "may-fly"
- It is still best known through…
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