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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
mayfly is a noun meaning "slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days". It carries one recorded sense.
slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days
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 mayfly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.