fjörefni
nafnorðhvorugkynfjör-efni
vítamín
Fallbeygingar
Eintala
Eintala m. greini
Nf.
fjörefni
fjörefnið
Þf.
fjörefni
fjörefnið
Þgf.
fjörefni
fjörefninu
Ef.
fjörefnis
fjörefnisins
Fleirtala
Fleirtala m. greini
Nf.
fjörefni
fjörefnin
Þf.
fjörefni
fjörefnin
Þgf.
fjörefnum
fjörefnunum
Ef.
fjörefna
fjörefnanna