Norwegian Bokmål
Noun
byll m (definite singular byllen, indefinite plural byller, definite plural byllene)
-  a boil or abscess
Derived terms
References
-  “byll” in The Bokmål Dictionary.
 
Norwegian Nynorsk
Etymology
Supposedly from Danish byld, as above.
Noun
byll m (definite singular byllen, indefinite plural byllar, definite plural byllane)
-  a boil or abscess
Derived terms
References
-  “byll” in The Nynorsk Dictionary.