| thrombocitose | Thrombocytose |
| thrombocyte | Blutplättchen |
| thrombocytopénie | Thrombozytopenie |
| Thrombocytémie essentielle | Essentielle Thrombozythämie |
| Thrombolyse | Thrombolyse |
| Thrombophilie | Thrombophilie |
| Thrombophilie par mutation du facteur V | Faktor-V-Leiden |
| thrombose | Thrombose |
| thrombose coronarienne | Koronarthrombose |
| Thrombose veineuse profonde | Thrombophlebitis |
| Thromboxane | Thromboxan |
| thrombus | Thrombus |
| ThrustSSC | ThrustSSC |
| Thrymr | Thrymr |
| Thryonomys | Rohrratten |
| thréonine | Threonin |
| Thrúd | Thrud |
| Thuban | Thuban |
| Thubten Gyatso | Thubten Gyatso |
| Thucydide | Thukydides |
| Thueyts | Thueyts |
| Thug | Thuggee |
| Thujone | Thujon |
| Thule | Thule |
| thulium | Thulium |
| Thulé | Thule |
| Thun | Thun |
| Thunbergia | Thunbergia |
| Thunbergia alata | Schwarzäugige Susanne |
| Thunder Bay | Thunder Bay |
| Thunderbird | Thunderbird |
| Thunderbirds | Thunderbirds |
| Thundorf | Thundorf TG |
| thune | Knete |
| Thunnus thynnus | Roter Thun |
| Thunstetten | Thunstetten BE |
| Thur | Thur |
| Thurgood Marshall | Thurgood Marshall |
| Thurgovie | Thurgau |
| Thuries | Thuries |
| Thuringe | Thüringen |
| Thuringes | Thüringer |
| Thuringien | Thüringer |
| thuringienne | Thüringerin |
| Thuringowa | Thuringowa |
| Thurn und Taxis | Thurn und Taxis |
| Thurrock | Thurrock |
| Thursday Next | Thursday Next |
| Thusis | Thusis |
| Thusnelda | Thusnelda |
| Thuya | Lebensbäume |
| Thuya géant de Californie | Riesen-Lebensbaum |
| Thuès | Thuès |
| Thyatire | Thyatira |
| Thyeste | Thyestes |
| thylacine | Beutelwolf |
| Thylacinidae | Beutelwolf |
| Thylacinus cynocephalus | Beutelwolf |
| Thylacoleo | Thylacoleo carnifex |
| Thylacosmilus | Thylacosmilus |
| Thylakoïde | Thylakoid |
| Thylogale | Filander |
| thym | Thymian |
| thym commun | Thymian |
| Thymallus | Äschen |
| Thymelaeaceae | Seidelbastgewächse |
| Thymine | Thymin |
| thymol | Thymol |
| Thymoétès | Thymoites |
| thymus | Bries |
| Thymus serpyllorum | Thymiane |
| Thyoné | Thyone |
| Thyra | Thyra |
| Thyreophora | Thyreophora |
| thyristor | Thyristor |
| Thyristor GTO | GTO-Thyristor |
| Thyropteridae | Amerikanische Haftscheibenfledermäuse |
| thyroïde | Schilddrüse |
| thyrse | Thyrsus |
| Thyréostimuline | Thyreotropin |
| thyréotoxicose | Thyreotoxikose |
| Thysanoptera | Fransenflügler |
| Thysanoures | Fischchen |
| Thysanura | Zottenschwänze |
| ThyssenKrupp AG | ThyssenKrupp |
| Thèbes | Theben |
| Thècle | Thekla |
| Thècle de la ronce | Grüner Zipfelfalter |
| Thècle du bouleau | Nierenfleck-Zipfelfalter |
| Thècle du chêne | Blauer Eichen-Zipfelfalter |
| Thècle du coudrier | Pflaumen-Zipfelfalter |
| thème | Gegenstand |
| thème de discussion | Gesprächsthema |
| Thèmes | Themen |
| Thèorème | Satz |
| thèse | These |
