Definitions for gallflyˈgɔlˌflaɪ
Random House Webster's College Dictionary
any of various insects that deposit their eggs in plants, causing the formation of galls.
Origin of gallfly:
gall wasp, gallfly, cynipid wasp, cynipid gall wasp(noun)
small solitary wasp that produces galls on oaks and other plants
gall midge, gallfly, gall gnat(noun)
fragile mosquito-like flies that produce galls on plants
any of various insects that deposit their eggs in plants causing galls in which the larvae feed
Any of various flies which produce galls.
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