Any of various insects of the order Ephemeroptera. Mayflies are fragile winged insects that develop from aquatic nymphs. In the adult stage they live no longer than a few days. Sometimes they are called "dayfly".
MAYFLY
Meaning of MAYFLY in English
English glossary of entomology and crop protection. Английский глоссарий энтомологии и защиты растений. 2012