| Nom. | dī | (deī) |
| Gen. | deōrum | (deum) |
| Dat. | dīs | (deīs) |
| Acc. | deōs | |
| Voc. | dī | (deī) |
| Abl. | dīs | (deīs) |
5. The Locative Singular ends in -ī; as, Corinthī, at Corinth.
6. The Genitive Plural has -um, instead of -ōrum,—
a) in words denoting money and measure; as, talentum, of talents; modium, of pecks; sēstertium, of sesterces.
b) in duumvir, triumvir, decemvir; as, duumvirum.
c) sometimes in other words; as, līberum, of the children; socium, of the allies.
Exceptions to Gender in the Second Declension.
[26]. 1. The following nouns in -us are Feminine by exception:—
a) Names of towns, islands, trees—according to the general rule laid down in [§ 15], 2; also some names of countries; as Aegyptus, Egypt.
b) Five special words,—
alvus, belly;
carbasus, flax;
colus, distaff;
humus, ground;
vannus, winnowing-fan.
c) A few Greek Feminines; as,—
atomus, atom;
diphthongus, diphthong.
2. The following nouns in -us are Neuter:—
pelagus, sea;
vīrus, poison;