helgiefni
nafnorð hvorugkyn
Beyging
eintalafleirtala
án greinismeð greinián greinismeð greini
nf.helgiefnihelgiefniðnf.helgiefnihelgiefnin
þf.helgiefnihelgiefniðþf.helgiefnihelgiefnin
þgf.helgiefnihelgiefninuþgf.helgiefnumhelgiefnunum
ef.helgiefnishelgiefnisinsef.helgiefnahelgiefnanna