dayfly

n. (dā"flī`)

(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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IN BRIEF: n. - Slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than forty-eight hours.

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The noun has one meaning:

Meaning #1: slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days
  Synonyms: mayfly, shadfly

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