Pronunciation: (mā'flī"), [key]
1. Also called shadfly. any insect of the order Ephemeroptera, having delicate, membranous wings with the front pair much larger than the rear and having an aquatic larval stage and a terrestrial adult stage usually lasting less than two days.
2. Also,May' fly". Angling.an artificial fly made to resemble this insect.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.