| Trikolore | tricolour |
| Trikolon | tricolon |
| Tribologie | tribology |
| Triole | triplet |
| Toxikologe | toxicologist |
| Trifle | trifle |
| Trikont | Third World |
| Triller | trill |
| Trilog | trialogue |
| Trinkhorn | drinking horn |
| Trikot | jersey |
| Trilogie | trilogy |
| Triol | triol |
| Tripolis | Tripoli |
| Triskele | triskele |
| Trisomie | trisomy |
| Lexikologe | lexicologist |
| Toxikologie | toxicology |
| Arkologie | arcology |
| Etruskologe | Etruscologist |