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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 dayfly
 蜉蝣

From: Webster's Revised Unabridged Dictionary (1913)

 Day·fly 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.
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From: WordNet (r) 2.0

 dayfly
      n : slender insect with delicate membranous wings having an
          aquatic larval stage and terrestrial adult stage usually
          lasting less than two days [syn: mayfly, shadfly]