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1 definition found

From: Webster's Revised Unabridged Dictionary (1913)

 E·phem·er·al a.
 1. Beginning and ending in a day; existing only, or no longer than, a day; diurnal; as, an ephemeral flower.
 2. Short-lived; existing or continuing for a short time only. “Ephemeral popularity.”
    Sentences not of ephemeral, but of eternal, efficacy.   --Sir J. Stephen.
 Ephemeral fly Zoöl., one of a group of neuropterous insects, belonging to the genus Ephemera and many allied genera, which live in the adult or winged state only for a short time. The larvæ are aquatic; -- called also day fly and May fly.