skifere is the masculine plural indefinite of skifer.

skiferN

Kven

rahtuN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:60795Edit on GitHub Suggest

ráktuN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:43241Edit on GitHub Suggest

Case	Sg	Pl
Indef	skifer	skifrer / skifere
Def	skiferen	skifrene / skiferne