geisladagur
nafnorð karlkyn
Beyging
eintalafleirtala
án greinismeð greinián greinismeð greini
nf.geisladagurgeisladagurinnnf.geisladagargeisladagarnir
þf.geisladaggeisladaginnþf.geisladagageisladagana
þgf.geisladegigeisladeginumþgf.geisladögumgeisladögunum
ef.geisladagsgeisladagsinsef.geisladagageisladaganna