[shad-flahy] 
[mey-flahy] | 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. |
| may·fly (mā'flī') n. Any of various fragile winged insects of the order Ephemeroptera that develop from aquatic nymphs and live in the adult stage no longer than a few days. Also called dayfly, shadfly. |
| shad·fly (shād'flī') n. See mayfly. |