| Dialysator | dialyzer |
| Katalysator | catalyst catalyzer catalytic converter |
| Dialyse | dialysis |
| Ionisator | ioniser ionizer |
| Diktator | dictator |
| Diastole | diastole |
| Dialekt | dialect slang |
| Dialektik | dialectic |
| Dialer | dialer |
| Dialog | dialogue dialog box |
| Diapositiv | diapositive |
| Diashow | slideshow |
| Diaspora | diaspora |
| Gladiator | gladiator |
| Radiator | radiator |
| dialektal | dialectal |
| Analysand | analysand |
| Analyst | analyst |
| Analystin | analyst |
| Biokatalysator | biocatalysator |