Fourth declension nouns are nouns that have a special suffix in the oblique (non-nominative) cases.
Feminine nouns ending in <i> have the suffix <er>
Feminine nouns ending in <y> have the suffix <ov> (or <v>)
Neuter nouns ending in <mja> have the suffix <en>
Neuter nouns ending in <ja> (or <a> due to a spelling rule) have the suffix <at> (or <jat;>)
Neuter nouns ending in <o> have the suffix <es>
Note: Most neuter nouns ending in <o> belong to the first declension.
Here is a table of fourth declension nouns.
| Singular | |||||||
| Masculine | Feminine | Neuter | |||||
| N |
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| G |
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| D |
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| A |
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| I |
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| L |
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| Plural | |||||||
| N |
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| A |
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| I |
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| L |
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Is <oko> a fourth declension noun? Why is its plural form <ochi> (or is this its dual form)? Why is the plural not <ochesa> (or <ochesi> if it is a dual form)?