Any of various insects that deposit their eggs in plants causing galls in which the larvae feed

• Fragile mosquito-like flies that produce galls on plants
• Small solitary wasp that produces galls on oaks and other plants

WordNet Word definitions in WordNet
n. small solitary wasp that produces galls on oaks and other plants [syn: gall wasp , cynipid wasp , cynipid gall wasp ] fragile mosquito-like flies that produce galls on plants [syn: gall midge , gall gnat ] any of various insects that deposit their eggs ...

Wiktionary Word definitions in Wiktionary
n. Any of various fly which produce galls.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 .