Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
blackfly is a noun meaning "blackish aphid that infests e.g. beans and sugar beets". It carries 2 recorded senses.
blackish aphid that infests e.g. beans and sugar beets
small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals
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 blackfly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.