Ephemeral fly

(Zool.) 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.

See also: Ephemeral

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.