mursteinen is the masculine singular definite of murstein.

mursteinN

Kven

tiilikiviN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:69766Edit on GitHub Suggest

tiilaN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:79975Edit on GitHub Suggest

Case	Sg	Pl
Indef	murstein	mursteiner
Def	mursteinen	mursteinene