| Triforium | triforium |
| Triennium | triennium |
| Tritium | tritium |
| Trivium | trivium |
| Oratorium | oratory |
| Brimborium | fuss to-do |
| Territorium | territory |
| Thorium | thorium |
| Tutorium | recitation |
| Ziborium | ciborium |
| Kriterium | criterion |
| Titonium | Tithonian |
| Patrimonium | patrimony |
| Trickfilm | animated cartoon |
| Triduum | triduum |
| Trilogie | trilogy |
| Trinom | trinomial |
| Tripolis | Tripoli |
| Trisomie | trisomy |
| Tritonus | tritone |