biturefni
nafnorð hvorugkyn
Beyging
eintalafleirtala
án greinismeð greinián greinismeð greini
nf.biturefnibiturefniðnf.biturefnibiturefnin
þf.biturefnibiturefniðþf.biturefnibiturefnin
þgf.biturefnibiturefninuþgf.biturefnumbiturefnunum
ef.biturefnisbiturefnisinsef.biturefnabiturefnanna