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What is "day fly"

The Collaborative International Dictionary
day fly

Ephemeral \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.''
    --V. Knox.

    Sentences not of ephemeral, but of eternal, efficacy.
    --Sir J. Stephen.

    Ephemeral fly (Zo["o]l.), 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 larv[ae] are aquatic; -- called also day fly and May fly.

Usage examples of "day fly".

They videotape the entire journey with night-vision equipment so IDF pilots can later watch and re-watch and re-watch again the very routes they may one day fly.