Proto-IE: *teri, *trey-
Meaning: num.: three
Hittite: tarrijanalli- c. 'der dritte' (Friedrich 214)
Tokharian: A trit, B trite 'third' (Adams 316); A tre (m.), tri (f.), B trai, tarya (PT *trey, *täryä) "three" (319)
Old Indian: m. tráyaḥ, n. ved. trī, f. tisráḥ 'three'; tr̥tīya- `third'; trayá- 'thrice', traya- n. 'triad'
Avestan: m. ɵrāyō, n. ɵrī, f. tišrō; ɵritya- 'third'
Other Iranian: OPers ɵitīya- 'third'
Armenian: erekh, gen. erich, instr. erivkh
Old Greek: trẹ̄̂s m., f. (Dor. trées, trēs), tría n., gen. triō̂n, dat. trisí (aeol. trissi) 'three'; tríto-, térto- 'third'
Germanic: { *ɵrīz, acc. *ɵrinz, n. *ɵrija-n usw.; *ɵridʌ́- 'third'; OIsl ɵrennr 'dreifach', ɵrenner 'drei' (bei Kollekt.) }
Latin: trēs, tria, trī-ginta, ord. tertius; terni 'je drei', trīni bei Pluraliatantum
Other Italic: Osk trís, Umbr acc. trif, n. triia
Celtic: OIr tri, trī, f. tēoir, tēora; Cymr tri, f. teir; tris 'third', Cymr trydydd, Corn trysse, trege
Albanian: tre, fem. tri; tritë 'third'
Russ. meaning: три
