noun, plural ephemeras, ephemerae [ih-fem-uh-ree] , for 2.
a plural of ephemeron.
an ephemerid.

1670–80; < Greek ephḗmera, neuter plural of ephḗmeros, taken as singular; see ephemeral

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World English Dictionary
ephemera (ɪˈfɛmərə)
n , pl -eras, -erae
1.  a mayfly, esp one of the genus Ephemera
2.  something transitory or short-lived
3.  (functioning as plural) a class of collectable items not originally intended to last for more than a short time, such as tickets, posters, postcards, or labels
4.  a plural of ephemeron
[C16; see ephemeral]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., 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 1630s.
Online Etymology Dictionary, © 2010 Douglas Harper
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