§89. Fourth Declension
Nouns of the Fourth Declension are declined as follows:
| manus, F., hand | lacus, M., lake | genū, N., knee |
| STEM manu- | STEM lacu- | STEM genu- |
| SINGULAR | |||||
| CASE-ENDINGS | CASE-ENDINGS | ||||
| NOM. | manus | lacus | -us | genū | -ū |
| GEN. | manūs | lacūs | -ūs | genūs | -ūs |
| DAT. | manuī(-ū) | lacuī(-ū) | -uī(-ū) | genū | -ū |
| ACC. | manum | lacum | -um | genū | -ū |
| ABL. | manū | lacū | -ū | genū | -ū |
| PLURAL | |||||
| NOM. | manūs | lacūs | -ūs | genua | -ua |
| GEN. | manuum | lacuum | -uum | genuum | -uum |
| DAT. | manibus | lacubus | -ibus(-ubus) | genibus | -ibus |
| ACC. | manūs | lacūs | -ūs | genua | -ua |
| ABL. | manibus | lacubus | -ibus(-ubus) | genibus | -ibus |
J. H. Allen and J. B. Greenough, New Latin Grammar (Boston: Ginn, 1903). Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities.