| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| Indo-Iranian |
| Avestan | tuϑruyē | pulled up, entertained | TBD | IEW UKY GPT |
| Avestan | ϑraoš- | to reach or bring to maturity, perfection, or completion | TBD | IEW UKY GPT |
| Avestan | ϑraošti- | (Maturity) Completion, End | TBD | IEW UKY GPT |
| West Germanic |
| Old High German | triuuit | excellent, little chicken, flower | TBD | IEW UKY GPT |
| Old High German | trowwen | to grow, to mature | TBD | IEW UKY GPT |
| Middle High German | ūf gedrouwen | grown up, adult | TBD | IEW UKY GPT |
| Middle High German | druo | Fruit | TBD | IEW UKY GPT |
| Older New High German | druhen, truhen | thrive, increase | TBD | IEW UKY GPT |
| North Germanic |
| Old Icelandic | þrōask | grow, thrive, mature | TBD | IEW UKY GPT |
| Old Icelandic | þrūðr | Strength | TBD | IEW UKY GPT |
| Old Icelandic | þroskr | (ripe, fully-grown) strong | TBD | IEW UKY GPT |
| Old Icelandic | þroski | Strength | TBD | IEW UKY GPT |
| Old Icelandic | þroskask | to become strong. | TBD | IEW UKY GPT |
| MISSING |
| Swiss | trüehen | thrive, increase | TBD | IEW UKY GPT |
| English |
| Anglo-Saxon | ðrȳð | Strength | TBD | IEW UKY GPT |