Appendix:Latin fourth declension

Latin words of the fourth declension are generally masculines or, less commonly, feminines in -us and neuters in -ū. The genitive is in -ūs.

The dative-ablative plural -ibus may appear less commonly as -ubus.

Examples:

• manus f
• cursus m

Examples:

• cornū, -ūs (-ū) n

Nouns derived from Greek feminine proper nouns in -ω (genitive -ους).

19th-century grammars often treat this type under the third declension,^[1] and alternative third-declension Latin suffixes are attested for some (e.g. Callistōnem). The distinction is no longer seen as salient, but classifying the otherwise indeclinable paradigm with genitive in -ūs as fourth-declension is consistent with the general practice of distinguishing declension based on the genitive singular ending.

Examples of this category: Aëllō, Allēctō (Alēctō), Argō, Brīmō, Callistō, Calypsō, Celaenō, Cētō, Chariclō, Clīō, Clōthō (Clōtō), Dīdō, Drȳmō, Ēchō, Enȳō, Eratō, Erichthō, Hērō (Erō), Īō, Īnō, Lātō, Lētō, Mantō, Melanthō, P��rō, Polyxō, Pȳthō, Sapphō, Theānō, Tȳrō, Xanthō

Citation form: ēchō, ēchūs f

Note: The accusative can also end in -ūn or -ōn, like Dīdō with accusative Dīdūn.

• Latin first declension
• Latin second declension
• Latin third declension
• Latin fifth declension
• Wikipedia article on declension
• Wikipedia article on Latin declension