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WordNet (r) 3.0 (2006) (WordNet)

gallfly
n 1: small solitary wasp that produces galls on oaks and other
plants [synonym: {gall wasp}, {gallfly}, {cynipid wasp},
{cynipid gall wasp}]
2: fragile mosquito-like flies that produce galls on plants
[synonym: {gall midge}, {gallfly}, {gall gnat}]
3: any of various insects that deposit their eggs in plants
causing galls in which the larvae feed