Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
gallfly is a noun meaning "small solitary wasp that produces galls on oaks and other plants". It carries 3 recorded senses.
small solitary wasp that produces galls on oaks and other plants
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
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for gallfly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.