mayfly

noun

Any of various delicate, winged insects of the order Ephemeroptera that develop from aquatic nymphs and in the adult stage live no longer than a few days and do not feed.

noun

Any of many fragile insects, of the order Ephemeroptera, that develop in fresh water, and live very briefly as adults.

noun

slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days