noun🔗ShareカゲロウAny of the many fragile insects of the order Ephemeroptera that develop in fresh water and live very briefly as winged adults."Example Sentence: "Near the river, swarms of mayflies appeared and died within a few hours, their brief adult lives already over." "川の近くで、カゲロウの大群が現れ、数時間のうちに死に絶え、短い成虫としての生涯はすでに終わっていた。insectanimalnaturebiologyecologyChat with AIVocabulary GamePractice Reading