steinaldrene is the masculine plural definite of steinalder.

steinalderN

Kven

1kiviaikaN

2kivikausiN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:36009Edit on GitHub Suggest

geađgeáigiN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:226364Edit on GitHub Suggest

Case	Sg	Pl
Indef	steinalder	steinaldrer / steinaldere
Def	steinalderen	steinaldrene / steinalderne