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Definition of: ephemerid
(i·fem′ər·id) noun
Any of a widespread order (Ephemerida) of insects with aquatic early stages and a very short–lived adult stage; of fragile build, with two or three long caudal filaments, hind wings reduced in size, and vestigial mouth parts; a mayfly, dayfly, or shadfly. [<NL Ephemeridae <Gk. ephēmeros. See EPHEMERA.]
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