noun🔗ShareEfeméridaAny of the many fragile insects of the order Ephemeroptera that develop in fresh water and live very briefly as winged adults."Along the riverbank, we saw hundreds of mayflies swarming, their brief adult lives already nearing their end. "A lo largo de la orilla del río, vimos cientos de efeméridas pululando, sus breves vidas adultas ya llegando a su fin.insectanimalbiologynatureecologyChat with AIVocabulary GamePractice Reading