Bulgarian мълния

← Bulgarian -ия (affix)

← Old Church Slavonic мльниꙗ (inherited)

← Old Church Slavonic млъни (mention)

← Old Church Slavonic мльни (mention)

← Old Church Slavonic млънии (mention)

← Old Church Slavonic мльнии (mention)

← Proto-Slavic *mъldni (inherited)

→ Russian молния (cognate)