abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light発光によって伴われる、突然の雲から雲へまたは雲から地上への放電電閃
the flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash); can scintillate for a second or more大気中での放電に伴う閃光(あるいはそんな閃光に似たもの)稲妻