| trionfo | rejoicing |
| Trionfo della morte | The Triumph of Death |
| Trionychidae | Trionychidae |
| triorchidismo | triorchidism |
| trioso | triose |
| Trioso fosfato isomerasi | Triosephosphate isomerase |
| Triossano | Trioxane |
| triossido | trioxide |
| triossido di diazoto | dinitrogen trioxide |
| triossido di zolfo | sulfur trioxide |
| triotto | roach |
| Trip Tucker | Charles Tucker III |
| tripartito | tripartite |
| Triphyophyllum peltatum | Triphyophyllum |
| Tripi | Abacaenum |
| Tripitaka Koreana | Tripitaka Koreana |
| Tripla Città | Tricity |
| Tripla doppia | Triple-double |
| Triple Agent - Agente speciale | Triple agent |
| Triple Crown Championship | Triple Crown Championship |
| Triple Gold Club | Triple Gold Club |
| tripletta | threefold |
| triplicare | treble |
| Triplice Alleanza | Triple Alliance |
| Triplice alleanza azteca | Aztec Triple Alliance |
| Triplice intesa | Triple Entente |
| Triplite | Triplite |
| triplo | triple |
| Triplo gioco | Romeo Is Bleeding |
| Triploblastico | Triploblasty |
| Triploidia | Triploid Syndrome |
| tripolare | tripolar |
| Tripoli | Tripoli |
| Tripolitania | Tripolitania |
| trippa | tripe |
| Trippel sort | Stooge sort |
| Trippstadt | Trippstadt |
| Triptofano | Tryptophan |
| Tripura | Tripura |
| Triquetra | Triquetra |
| trireme | trireme |
| Tririan | Tirian |
| tris | tick-tack-toe |
| Tris di cuori | For Your Love |
| Trisagio | Sanctus |
| Trisagion | Trisagion |
| trisavola | great-great-grandmother |
| trisavolo | great-great-grandfather |
| triscaidecafobia | triskaidekaphobia |
| Triscele | Triskelion |
| trisecare | trisect |
| Trish Stratus | Trish Stratus |
| trisillabico | trisyllabic |
| trisillabo | trisyllable |
| trisma | lockjaw |
