| vās, vāsis (vessel); | Plu., vāsa, vāsorōum, vāsīs, etc. |
| jūgerum, jūgerī (acre); | Plu., jūgera, jūgerum, jūgeribus, etc. |
2. Several nouns, while belonging in the main to one declension, have certain special forms belonging to another. Thus:—
a) Many nouns of the First Declension ending in -ia take also a Nom. and Acc. of the Fifth; as, māteriēs, māteriem, material, as well as māteria, māteriam.
b) Famēs, hunger, regularly of the Third Declension, has the Abl. famē of the Fifth.
c) Requiēs, requiētis, rest, regularly of the Third Declension, takes an Acc. of the Fifth, requiem, in addition to requiētem.
d) Besides plēbs, plēbis, common people, of the Third Declension, we find plēbēs, plēbĕī (also plēbī, see [§ 52], 2), of the Fifth.
Heterogeneous Nouns.
[60]. Heterogeneous nouns vary in Gender. Thus:—
1. Several nouns of the Second Declension have two forms,—one Masc. in -us, and one Neuter in -um; as, clipeus, clipeum, shield; carrus, carrum, cart.
2. Other nouns have one gender in the Singular, another in the Plural; as,—
| SINGULAR. | PLURAL. |
| balneum, n., bath; | balneae, f., bath-house. |
| epulum, n., feast; | epulae, f., feast. |
| frēnum, n., bridle; | frēnī, m.(rarely frēna, n.), bridle. |
| jocus, m., jest; | joca, n. (also jocī, m.), jests. |
| locus, m., place; | loca, n., places; locī, m., passages or topics in an author. |
| rāstrum, n., rake; | rāstrī, m.; rāstra, n., rakes. |
a. Heterogeneous nouns may at the same time be heteroclites, as in case of the first two examples above.