Definitions

from The Century Dictionary.

  • noun A May-fly: a popular name of the neuropterous insects of the family Ephemeridæ: so called because, however long they may live in the larval state, in their perfect form they exist only from a few hours to a few days, taking no food, but only propagating and then dying. See Ephemeridæ.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A mayfly.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

day +‎ fly, since the adults typically live only for a day.

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Examples

  • Bloodless and many footed animals, whether furnished with wings or feet, move with more than four points of motion; as, for instance, the dayfly moves with four feet and four wings: and, I may observe in passing, this creature is exceptional not only in regard to the duration of its existence, whence it receives its name, but also because though a quadruped it has wings also.

    The History of Animals 2002

  • The 22-year-old manual worker has been living like a "dayfly," as he calls it, barely making a living enough for a day.

    ABC News: Top Stories 2011

  • Dazzled, the dayfly flutters round your wick, crackles, flares and cries: I bless this torch!

    hustler of culture 2009

  • Bloodless and many footed animals, whether furnished with wings or feet, move with more than four points of motion; as, for instance, the dayfly (ephémeron) moves with four feet and four wings: and, I may observe in passing, this creature is exceptional not only in regard to the duration of its existence, whence it receives its name, but also because though a quadruped it has wings also.

    ScienceBlogs Channel : Life Science 2008

  • Be still, ere I smite you like the dayfly you are! "

    The Boat of a Million Years Anderson, Poul, 1926- 1989

  • Be still, ere I smite you like the dayfly you are! "

    The Boat of a Million Years Anderson, Poul, 1926- 1988

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