According to Schaffner, from a -nos derivative of *rutis, from Proto-Indo-European *h₂rew- (“to glow, shine”).[1]
O/ā-stem | |||
---|---|---|---|
masculine | singular | dual | plural |
nominative | *ruteinos | *ruteinou | *ruteinoi |
vocative | *ruteine | *ruteinou | *ruteinoi |
accusative | *ruteinom | *ruteinou | *ruteinoms |
genitive | *ruteinī | *ruteinous | *ruteinom |
dative | *ruteinūi | *ruteinobom | *ruteinobos |
instrumental | *ruteinū | *ruteinobim | *ruteinobis |
feminine | singular | dual | plural |
nominative | *ruteinā | *ruteinai | *ruteinās |
vocative | *ruteinā | *ruteinai | *ruteinās |
accusative | *ruteinam | *ruteinai | *ruteinams |
genitive | *ruteinās | *ruteinous | *ruteinom |
dative | *ruteinai | *ruteinābom | *ruteinābos |
instrumental | *? | *ruteinābim | *ruteinābis |
neuter | singular | dual | plural |
nominative | *ruteinom | *ruteinou | *ruteinā |
vocative | *ruteinom | *ruteinou | *ruteinā |
accusative | *ruteinom | *ruteinou | *ruteinā |
genitive | *ruteinī | *ruteinous | *ruteinom |
dative | *ruteinūi | *ruteinobom | *ruteinobos |
instrumental | *ruteinū | *ruteinobim | *ruteinobis |
Declension of the comparative | |||
---|---|---|---|
masculine | singular | dual | plural |
nominative | *ruteinyūs | *? | *ruteinyoses |
vocative | *ruteinyūs | *? | *ruteinyoses |
accusative | *ruteinyosam | *? | *ruteinyosams |
genitive | *ruteinisos | *? | *ruteinisom |
dative | *ruteinisei | *? | *ruteinisbos |
instrumental | *ruteinisī | *? | *ruteinisbis |
feminine | singular | dual | plural |
nominative | *ruteinyūs | *? | *ruteinyoses |
vocative | *ruteinyūs | *? | *ruteinyoses |
accusative | *ruteinyosam | *? | *ruteinyosams |
genitive | *ruteinisos | *? | *ruteinisom |
dative | *ruteinisei | *? | *ruteinisbos |
instrumental | *ruteinisī | *? | *ruteinisbis |
neuter | singular | dual | plural |
nominative | *ruteinis | *? | *? |
vocative | *ruteinis | *? | *? |
accusative | *ruteinis | *? | *? |
genitive | *ruteinisos | *? | *ruteinisom |
dative | *ruteinisei | *? | *ruteinisbos |
instrumental | *ruteinisī | *? | *ruteinisbis |
The palatalization in Old Irish ruithen is irregular, as *e and *ei normally do not palatalize preceding consonants that are preceded by a non-front vowel. The word may have been reshaped to *rutinos in Goidelic, which should regularly yield palatalization.