sumardagur
nafnorð karlkyn
Fallbeygingar
Eintala
eintala með greini
nefnifall
sumardagur
sumardagurinn
þolfall
sumardag
sumardaginn
þágufall
sumardegi
sumardeginum
eignarfall
sumardags
sumardagsins
Fleirtala
fleirtala með greini
nefnifall
sumardagar
sumardagarnir
þolfall
sumardaga
sumardagana
þágufall
sumardögum
sumardögunum
eignarfall
sumardaga
sumardaganna