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Definition of fly
noun (plural flies /flīz/)
- a flying insect of a large order characterized by a single pair of transparent wings and sucking (and often also piercing) mouthparts. Flies are noted as vectors of disease. See also Diptera.
- Order Diptera: numerous families
Old English flȳge, flēoge, denoting any winged insect; related to Dutch vlieg and German Fliege, also to fly1