WordReference Random House Learner's Dictionary of American English © 2015
may•fly /ˈmeɪˌflaɪ/USA pronunciation n. [countable] ,pl. -flies.

    Insectsan insect with large clear wings and a threadlike tail.

Collins Concise English Dictionary © HarperCollins Publishers::

mayfly /ˈmeɪˌflaɪ/ n ( pl -flies)
  1. Also called: dayfly any insect of the order Ephemeroptera (or Ephemerida). The short-lived adults, found near water, have long tail appendages and large transparent wings; the larvae are aquatic

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