ephemera

[ ih-fem-er-uh ]
/ ɪˈfɛm ər ə /

noun, plural e·phem·er·as, e·phem·er·ae [ih-fem-uh-ree] /ɪˈfɛm əˌri/ for 2.

a plural of ephemeron.
an ephemerid.

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Origin of ephemera

1670–80; < Greek ephḗmera, neuter plural of ephḗmeros, taken as singular; see ephemeral
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for ephemerae

British Dictionary definitions for ephemerae

ephemera
/ (ɪˈfɛmərə) /

noun plural -eras or -erae (-əˌriː)

a mayfly, esp one of the genus Ephemera
something transitory or short-lived
(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
a plural of ephemeron

Word Origin for ephemera

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