| Dampf | vapour |
| Datenfernübertragung (DFÜ) | remote data transmission |
| Deckel | cover |
| Dehnbarkeit | flexibility |
| Dekontamination | decontamination |
| Desinfektion | disinfection |
| Desinfektionslösung | disinfecting solution |
| Desinfektionsmittel | disinfecting agent |
| Desorption | desorption |
| Deutsche Gesetzliche Unfallversicherung | German statutory accident insurance |
| DFÜ | RDT |
| Diastole | diastole |
| Dichte | leak tightness |
| Dichtheit | leaktightness |
| Dichtigkeit | leaktightness |
| Dichtigkeitsprüfung | test for leaktightness |
| Dichtprüfung | test for leaktightness |
| Dichtring | gasket |
| Dichtung | sealing |
| Diffusion | permeability |
| Direktive, Europäische | European Directive |
| Dioxin | dioxin |
| Dochtwirkung | wicking action |
| Dritteldruck | reference value, indicating 1/3 of remaining breathing pressure |
| Drittelzeit | approximate time, indicating 1/3 of planned operation time |
| Druck | pressure |
| Druck, statischer | static pressure |
| Druckabfall | pressure drop |
| Druckbehälter | pressure vessel |
| Druckentlastungsvorrichtung | blow out release |
| Druckgas | compressed gas |
| Druckgasflasche | compressed gas cylinder |
| Druckluft | compressed air |
| Druckluft für Atemschutzgeräte | compressed air for use with respiratory protective devices |
| Druckluft–Leitung | compressed air line |
| Druckluft–Netz | permanently installed compressed air line system |
| Druckluft–Schlauchgerät | compressed air line breathing apparatus |
| Druckluft–Versorgung | compressed air supply |
| Druckluft – Zuführungsschlauch | compressed air supply tube (medium pressure) |
| Druckluft – Zuführungsschlauch mit Kupplung | compressed air supply tube (medium pressure) with coupling |
| Druckluftatmer | self-contained open-circuit compressed air breathing apparatus |
| Druckluftflasche | compressed air cylinder |
| Druckluftflasche – Flaschendruck | compressed air cylinder – cylinder pressure |
| Druckluftflasche -Flaschendruckprüfung | compressed air cylinder – cylinder pressure test |
| Druckluftflasche -Flaschenspannband | compressed air cylinder – cylinder tensioning strap |
| Druckluftflasche – Flaschenventil | compressed air cylinder – cylinder valve |
| Druckluftflasche – Flaschenventilanschluss | compressed air cylinder – cylinder valve connection |
| Druckluftflasche – Flaschenverschluss | compressed air cylinder – cylinder seal |
| Druckluft-Injektor | compressed air injector |
| Druckluftvorrat | compressed air reserve |
| Druckmessgerät | pressure gauge |
| Druckminderer | pressure reducer |
| Drucksauerstoff | compressed oxygen |
| Drucksauerstoffgerät | compressed oxygen apparatus |
| Drucksauerstoff-Selbstretter | compressed oxygen escape <s> </s>device |
| Druck-Volumen-Kurve | pressure volume loop |
| Druck-Zeit-Tabelle | pressure time table |
| Durchbruch | breakthrough |
| Durchbruchkonzentration | breakthrough concentration |
| Durchbruchzeit | breakthrough time |
| Durchflussmesser | flowmeter |
| Durchlassgrad | penetration |
| Durchlässigkeit | porosity |
| Drucksauerstoff | compressed oxygen |
| Durchgangsärzte | accident insurance consultant: physician authorized by the Employers Liability Insurance Association who has to be consulted after an occupational accident |
| Durchsage | announcement |
| Durchstichfestigkeit | puncture resistance |
