Fulgor | Webster's Dictionary of the English Language

fulgor
fulgor, ōris, m. [fulgeo], I lightning , a flash of lightning (mostly poet. for fulgur): fulgorem ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
fulgor
fulgor ōris, m 2 FLAG-, lightning, a flash of lightning : vibratus ab aethere, V.: notam fulgore d...

An Elementary Latin Dictionary