Proto-Baltic: *trī̃-s, *trī̂-, *trej-, *tre-t-ja- adj., *tir-t-a- adj.
Meaning: three
Lithuanian: trī̃s 'drei'; trī́-lika '13'; trẽčia- 'dritte'; trejì, f. trẽjōs 'drei'; trẽčia-; treigī̃- 'Dreijährige(r)'
Lettish: trîs 'drei'; treji, f. trejas 'drei'; trešs 'dritte'
Old Prussian: tris 'drei', tirt(i)s
