(redirected from ephemerons)
Also found in: Thesaurus, Medical.


n. pl. e·phem·er·a (-ər-ə) or e·phem·er·ons
1. A short-lived thing.
2. ephemera Printed matter of passing interest.

[Greek ephēmeron, mayfly, from neuter of ephēmeros, daily, short-lived; see ephemeral.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -era (-ərə) or -erons
(usually plural) something transitory or short-lived
[C16: see ephemeral]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ɪˈfɛm əˌrɒn, -ər ən)

n., pl. -er•a (-ər ə)
anything short-lived or ephemeral.
[1570–80; < Greek ephḗmeron short-lived insect, n. use of neuter of ephḗmeros; see ephemeral]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


anything shortlived, or of brief duration, especially certain types of insects such as the mayfly.
See also: Insects
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ephemeron - anything short-lived, as an insect that lives only for a day in its winged form
insect - small air-breathing arthropod
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.