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ephemeron

[ih-fem-uh-ron, -er-uh n] /ɪˈfɛm əˌrɒn, -ər ən/
noun, plural ephemera
[ih-fem-er-uh] /ɪˈfɛm ər ə/ (Show IPA),
ephemerons.
1.
anything short-lived or ephemeral.
2.
ephemera, items designed to be useful or important for only a short time, especially pamphlets, notices, tickets, etc.
Origin
1570-1580
1570-80; < Greek ephḗmeron short-lived insect, noun use of neuter of ephḗmeros; see ephemeral
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ephemeron

ephemeron

/ɪˈfɛməˌrɒn/
noun (pl) -era (-ərə), -erons
1.
(usually pl) something transitory or short-lived
Word Origin
C16: see ephemeral
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ephemeron
n.

1620s, from Greek (zoon) ephemeron, neuter of ephemeros (see ephemera). Figurative use by 1771.

Online Etymology Dictionary, © 2010 Douglas Harper
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