Day″fly′ (dā″flī′), n.(Zoöl.) A neuropterous insect of the genus Ephemera and related genera, of many species, and inhabiting fresh water in the larval state; the ephemeral fly; — so called because it commonly lives but one day in the winged or adult state. See Ephemeral fly, under Ephemeral.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.