| testuale | verbal |
| Testudines | Turtle |
| Testudinidae | Tortoise |
| Testudo atlas | Testudo atlas |
| Testudo graeca | Greek Tortoise |
| Testudo horsfieldii | Russian Tortoise |
| Testudo marginata | Marginated Tortoise |
| testuggine | tortoise |
| Testuggine romana | Turtle |
| TET | Tet |
| tetania | tetany |
| tetano | lockjaw |
| Tetanospasmina | Tetanospasmin |
| Tetanurae | Tetanurae |
| Tete | Tete |
| Teteoinnan | Toci |
| Tethered | Tether satellite |
| Teti | Thetis |
| tetico | thetic |
| Tetovo | Tetovo |
| tetra | tetra |
| Tetra Pak | Tetra Pak |
| tetrabromuro | tetrabromide |
| tetrabromuro di carbonio | carbon tetrabromide |
| Tetracarbonilnichel | Nickel carbonyl |
| Tetraceratops insignis | Tetraceratops insignis |
| Tetracerus quadricornis | Four-horned Antelope |
| Tetracicline | Tetracycline antibiotics |
| Tetracisesaedro | Tetrakis hexahedron |
| tetracloruro | tetrachloride |
| tetracloruro di carbonio | carbon tetrachloride |
| Tetracloruro di silicio | Silicon tetrachloride |
| Tetracloruro di titanio | Titanium tetrachloride |
| Tetracordo | Tetrachord |
| Tetradotossina | Tetrodotoxin |
| tetraedrico | tetrahedral |
| Tetraedro | Tetrahedron |
| Tetraedro troncato | Truncated tetrahedron |
| tetraetile | tetraethyl |
| Tetrafarmacum | Tetrapharmacum |
| tetrafluorometano | tetrafluoromethane |
| tetrafluoruro | tetrafluoride |
| tetrafluoruro di carbonio | carbon tetrafluoride |
| tetraggine | obscurity |
| tetragramma | Tetragrammaton |
| Tetragramma biblico | Jehovah |
| tetraidrocannabinolo | tetrahydrocannabinol |
| Tetraidrocannabivarina | Tetrahydrocannabivarin |
| tetraidrofolato | tetrahydrofolate |
| tetraidruro | tetrahydride |
| tetraioduro | tetraiodide |
| tetraioduro di carbonio | carbon tetraiodide |
| Tetrametiletilendiammina | Tetramethylethylenediamine |
| Tetrametilsilano | Tetramethylsilane |
| Tetranitrato di pentaeritrite | PETN |
| Tetranychus urticae | Tetranychus urticae |
| Tetrao mlokosiewiczi | Caucasian Black Grouse |
| Tetraodon | Tetraodon |
| Tetraodon mbu | Mbu pufferfish |
| Tetraodontidae | Tetraodontidae |
| tetrapirrolo | tetrapyrrole |
| Tetrapoda | Tetrapod |
| Tetrarch | Tetrarch tank |
| tetrarchia | tetrarchy |
| Tetrax tetrax | Little Bustard |
| Tetrico | Tetricus I |
| Tetrico iunior | Tetricus II |
| Tetris | Tetris |
| tetro | bleak |
| tetrossido | tetroxide |
| tetrossido di diazoto | dinitrogen tetroxide |
| tetta | boob |
| tettarella | nipple |
| Tettau | Tettau |
| Tettenweis | Tettenweis |
| tetti | roofs |
| Tettnang | Tettnang |
| tetto | roof |
| tetto a falda | lean-to |
| tetto scorrevole | sliding roof |
| tettoia | lean-to |
| tettonica | tectonics |
| Tettonica a zolle | Plate tectonics |
| tettonico | tectonic |
| tettuccio apribile | sunroof |
