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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.]


n, pl -era (-ərə) or -erons
(usually plural) something transitory or short-lived
[C16: see ephemeral]


(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]


anything shortlived, or of brief duration, especially certain types of insects such as the mayfly.
See also: Insects
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