1. Any of various insects that deposit their eggs in plants causing galls in which the larvae feed
   "The oak tree leaves were covered in galls caused by gallflies"
    
2. Small solitary wasp that produces galls on oaks and other plants
   "The oak gallfly's larvae develop inside the galls they induce on oak leaves";
   - gall wasp, cynipid wasp, cynipid gall wasp
    
3. Fragile mosquito-like flies that produce galls on plants
   "The oak leaves were covered in galls caused by gallflies";
   - gall midge, gall gnat

Derived forms: gallflies

Type of: dipteran, dipteron, dipterous insect, insect, two-winged insects, wasp

Part of: Cecidomyidae, Cynipidae, family Cecidomyidae, family Cynipidae

Encyclopedia: Gallfly