Etymology
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ephemeron (n.)

"insect which lives for a very short time in its winged state," 1620s, from Greek (zōon) ephemeron, neuter of adjective ephemeros "living but a day" (see ephemera). Figurative use by 1771.

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Definitions of ephemeron

ephemeron (n.)
anything short-lived, as an insect that lives only for a day in its winged form;
Synonyms: ephemeral
From wordnet.princeton.edu