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(zoology) Any insect of the order Diptera; characterized by having two wings (except for some wingless species), also called true flies.
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(non-technical) Especially, any of the insects of the family Muscidae, such as the common housefly (other families of Diptera include mosquitoes and midges).
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Those or any similar but not closely related insect, such as a dragonfly, butterfly, or gallfly.
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(fishing) A lightweight fishing lure resembling an insect.
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(weightlifting) A chest exercise performed by moving extended arms from the sides to in front of the chest. (also flye)
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(swimming) The butterfly stroke (plural is normally flys).
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(obsolete) A witch's familiar.
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(obsolete) A parasite.
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(preceded by definite article) A simple dance in which the hands are shaken in the air, popular in the 1960s.
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(finance) A butterfly (combination of four options).