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Definition of Dayfly
1. Noun. Slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days.
Generic synonyms: Ephemerid, Ephemeropteran
Group relationships: Ephemeridae, Family Ephemeridae
Definition of Dayfly
1. n. 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.
Definition of Dayfly
1. Noun. A mayfly. ¹
¹ Source: wiktionary.com
Definition of Dayfly
1. a mayfly [n -FLIES] - See also: mayfly
Medical Definition of Dayfly
1.