Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A short-lived thing.
  • n. Printed matter of passing interest.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. something short lived or transitory

from the GNU version of the Collaborative International Dictionary of English

  • n. One of the ephemeral flies.

from The Century Dictionary and Cyclopedia

  • n. An insect which lives but for a day or for a very short time; hence, any being whose existence is very brief.

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

  • n. anything short-lived, as an insect that lives only for a day in its winged form

Etymologies

Greek ephēmeron, mayfly, from neuter of ephēmeros, daily, short-lived; see ephemeral.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek eph- + ἡμέρα (hēmerā, "day"). (Wiktionary)

Examples

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  • Who had a list of sub-atomic particles? Pterodactyl?

    November 18, 2008