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ephemera - 6 dictionary results
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e⋅phem⋅er⋅a

  [i-fem-er-uh]
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–noun, plural -er⋅as, -er⋅ae  [-uh-ree] for 2.
1. a pl. of ephemeron.
2. an ephemerid.
Origin:
1670–80; < Gk ephmera, neut. pl. of ephmeros, taken as sing.; see ephemeral

e⋅phem⋅er⋅on

  [i-fem-uh-ron, -er-uhn]
–noun, plural -er⋅a  [-er-uh] , -er⋅ons.
1. anything short-lived or ephemeral.
2. ephemera, items designed to be useful or important for only a short time, esp. pamphlets, notices, tickets, etc.
Origin:
1570–80; < Gk ephmeron short-lived insect, n. use of neut. of ephmeros; see ephemeral
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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e·phem·er·a   (ĭ-fěm'ər-ə)   
n.  A plural of ephemeron.
e·phem·er·on   (ĭ-fěm'ə-rŏn')   
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.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Ephemera

E*phem"e*ra\, n. [NL., fr. Gr. ? a day fly, fr. ? daily, lasting but a day; ? over + ? day.]

1. (Med.) A fever of one day's continuance only.

2. (Zo["o]l.) A genus of insects including the day flies, or ephemeral flies. See Ephemeral fly, under Ephemeral.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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ephemera 
1398, originally a medical term, from M.L. ephemera (febris) "(fever) lasting a day," from fem. of ephemerus, from Gk. ephemeros "lasting only one day," from epi "on" + hemerai, dat. of hemera "day," from PIE *amer- "day." Sense extended to short-lived insects and flowers; general sense of "transitory" is first attested c.1639. Ephemeral is from 1576. Ephemeris "table of astronomical calculations" is from 1551.
Online Etymology Dictionary, © 2001 Douglas Harper
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