No descendant preserves the final -ʀ, but it must have once been present in the southern languages on account of the word being monosyllabic.
This numeral needs an inflection-table template.
- Old English: þrī, þriē, þrȳ, þrēo
- Old Frisian: thrē, thriā
- Old Saxon: thrīe
- Old Dutch: thri, *thrie
- Old High German: drī