Dayfly
Pronunciation : Day"fly`
Part of Speech : n.
Definition : Defn: A neuropterous insect of the genus Ephemera and related genera, of many species, and inhabiting fresh water in the larval state; the ephemeral fly; -- so called because it commonly lives but one day in the winged or adult state. See Ephemeral fly, under Ephemeral.
(Zo?l.)
Source : Webster's Unabridged Dictionary, 1913