marsvina is the neuter plural definite of marsvin.

marsvinN

Kven

marsviiniN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:5200Edit on GitHub Suggest

márspiidniN; máršaN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:236708Edit on GitHub Suggest

Case	Sg	Pl
Indef	marsvin	marsvin
Def	marsvinet	marsvina