Numerals As Prefixes
Special forms of the numerals were used as prefixes, usually to form bahuvrihis (like five-fingered in English):
| Number | Prefix (Fortson) |
|---|---|
| one- (together, same) | *sm̥- |
| two- | *dwi- |
| three- | *tri- |
| four- | *kʷ(e)tru- or *kʷetwr̥- |
Read more about this topic: Proto-Indo-European Numerals