small solitary wasp that produces galls on oaks and other plants
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fragile mosquito-like flies that produce galls on plants
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any of various insects that deposit their eggs in plants causing galls in which the larvae feed
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Gallfly \Gall"fly`\, n.; pl. {Gallflies}. (Zo["o]l.) An insect that deposits its eggs in plants, and occasions galls, esp. any small hymenopteran of the genus {Cynips} and allied genera. See Illust. of {Gall}.