The Old Norse word dimma
Word dimma
d i m m a
Meaning darkness

Other words that might be of interest
eisa ‘fire’, eldr ‘fire’, aska ‘ashes’, skírr ‘clear, bright’, døkkr ‘dark’, dimmar ‘dark, gloomy’, myrkr ‘dark, murky’, logi ‘flame, blaze’, heitr ‘hot, burning’, skuggi ‘shadow’, reykr ‘smoke, steam’, sól ‘sun’, sunna ‘sun’