| 1 | French | xanthine | xanthine |
| 2 | French | -ine | feminine singular of -in; female equivalent of... |
| 3 | French | -é | past participle root verb suffix of regular -er... |
| 4 | Middle French | -é | — |
| 5 | Old French | -é | used to form past participles of regular -er... |
| 6 | Latin | -a | suffixed to the roots of verbs, forms agent... |
| 7 | Proto-Italic | -ā | — |
| 8 | Proto-Indo-European | -éh₂ | — |