Probably from Proto-Balto-Slavic *trāˀwā́ˀ, of uncertain origin, with no analogues outside of Slavic. Apparently related to Proto-Slavic *traviti (“to chew, to gnaw, to poison”), however, not certain in what manner.
Possibly from the same root as Proto-Slavic *tryti (“to rub, to crush”), Proto-Slavic *truti (“to consume, to poison”), which are believed to continue Proto-Indo-European *trewH-. For similar vṛddhi-like construction, compare Proto-Slavic *slava (“fame”) from Proto-Slavic *sluti (“to utter”). If correct, then likely akin to Ancient Greek τρῡ́ω (trū́ō, “to exhaust”), Ancient Greek τραῦμα (traûma, “wound, damage”), Ancient Greek τρώγω (trṓgō, “to chew, to gnaw”), and Proto-Germanic *þrēaną (“to twist, to throw”).
See *traviti for further discussion.
singular | dual | plural | |
---|---|---|---|
nominative | *trāvà | *trãvě | *trāvỳ |
genitive | *trāvỳ | *trāvù | *trãvъ |
dative | *trāvě̀ | *trāvàma | *trāvàmъ |
accusative | *trāvǫ̀ | *trãvě | *trāvỳ |
instrumental | *trāvòjǫ, *trãvǫ** | *trāvàma | *trāvàmī |
locative | *trāvě̀ | *trāvù | *trāvàsъ, *trāvàxъ* |
vocative | *travo | *trãvě | *trāvỳ |
* -asъ is the expected Balto-Slavic form but is found only in some Old Czech documents; -axъ is found everywhere else and is formed by analogy with other locative plurals in -xъ.
** The second form occurs in languages that contract early across /j/ (e.g. Czech), while the first form occurs in languages that do not (e.g. Russian).