Noun gallfly has 3 senses
  1. gall wasp, gallfly, cynipid wasp, cynipid gall wasp - small solitary wasp that produces galls on oaks and other plants
    --1 is a kind of wasp
    --1 is a member of Cynipidae, family Cynipidae
  2. gall midge, gallfly, gall gnat - fragile mosquito-like flies that produce galls on plants
    --2 is a kind of dipterous insect, two-winged insects, dipteran, dipteron
    --2 is a member of Cecidomyidae, family Cecidomyidae
    --2 has particulars: Hessian fly, Mayetiola destructor
  3. gallfly - any of various insects that deposit their eggs in plants causing galls in which the larvae feed
    --3 is a kind of
    insect
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