biologien is the masculine singular definite of biologi.

biologiN

Kven

biologiaN; biologiiN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:94764Edit on GitHub Suggest

biologiijaN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:37850Edit on GitHub Suggest

Case	Sg	Pl
Indef	biologi	biologier
Def	biologien	biologiene