svartrotte (Norwegian Nynorsk) comes from Norwegian Nynorsk svart, from Old Norse svartr, from Proto-Germanic swartaz, from Proto-Indo-European swordo- — dirty, dark, black.
svartrotte (Norwegian Nynorsk): a black rat, "Rattus rattus"
Definitions
a black rat, "Rattus rattus"
Ancestry of “svartrotte”, step by step
svartrotte traces back through two separate lines of ancestry.