GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Ephemeral , a.
    Beginning and ending in a day; existing only, or no longer than, a day; diurnal; as, an ephemeral flower.
   1913 Webster
   Short-lived; existing or continuing for a short time only. “Ephemeral popularity.” 
   V. Knox.
   
   1913 Webster
   Sentences not of ephemeral, but of eternal, efficacy.
   Sir J. Stephen.
   
   1913 Webster
   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.
   1913 Webster