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Brugmann (1892: 464) suggested original meaning "middle (= protruding) finger", quoting Sanskritतर्मन्(tarman, “the top of the sacrificial post”) (see *térmn̥) and Ancient Greekτέρθρον(térthron, “tip, end”). This idea was developed by Fay (1910: 416-17), who reconstructed *tri-sth₂-o-s (“tip finger”). In the first component he identified the locative *tr-í- “on-tip”, while the second ("stander") has also to form other finger names, e. g. Proto-Indo-Iranian*Hangúštʰas(“thumb”), Sanskritकनिष्ठा(kaniṣṭhā, “little finger”), Proto-Balto-Slavic*pírštan(“finger”), etc.
The feminine *tisres is from **trisres, with the same feminine marker, -sr-, of *kʷétesres.
Proto-Tocharian: *treyä[2] (see there for further descendants)
References
^ Fortson, Benjamin W. (2004, 2010) Indo-European Language and Culture: An Introduction, Oxford: Blackwell
^ Adams, Douglas Q. (2013) “trai”, in A Dictionary of Tocharian B: Revised and Greatly Enlarged (Leiden Studies in Indo-European; 10), Amsterdam, New York: Rodopi, →ISBN, pages 339-340