OIcel feminine root nouns
A small class of OIcel feminine nouns do not fall into either the strong (vowel stem) or the weak (consonant stem) categories. The so called feminine root nouns follow the following paradigm
| case | sg.fem | pl.fem |
|---|---|---|
| nom | bók-∅ | bœk-r⁺ |
| gen | bók-ar | bók-a |
| dat | bók-∅ | bók-um |
| acc | bók-∅ | bœk-r⁺ |
In the singular the declension mirrors OIcel ō-stems, in the plural OIcel morphophonoligcal i-umlaut is exibited. Some nouns take the i-umlauting ending -r⁺ for the gen.sg too.