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dayfly n. 蜉蝣 蜉蝣 dayfly n 1: slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days [synonym: {mayfly}, {dayfly}, {shadfly}] Dayfly \Day"fly`\ (d[=a]"fl[imac]`), n. (Zool.)
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}. [1913 Webster]
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