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A neuropterous insect of the family Ephemeridæ; one of the Ephemerina; an ephemerid; a day-fly. See the technical words, and cut under day-fly.
(noun)
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In Great Britain, a neuropterous insect of the suborder Trichoptera, and especially of the family Phryganeidæ, as Sialis lutaria; the caddis-fly.
(noun)
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An artificial fly made in imitation of the May-fly.
(noun)
The Century Dictionary (Public Domain)