- decolonise
- dead load
- devoted to
- doorstep
- destructive distillation
- downiness
- dispersing
- daybook
- dendrite
- domestic llama
- domesday book
- domestic servant
- dawson river salmon
- delegating
- disseminated sclerosis
- discoid lupus erythematosus
- disseminated multiple sclerosis
- DLE
- dermatosclerosis
- donkey boiler
- donkey pump
- disaffirmation
- dram
- double digit
- deoxycortone acetate,
- Dexedrine
- dextroamphetamine sulphate
- dioxide
- degree of sporing
- degression
- dignify
- Doctor of Laws
- Doctor of Humane Letters
- Doctor of Humanities
- Doctor of Fine Arts
- DD
- Doctor of Music
- DMus
- Doctor of Education
- DDS
- Doctor of Dental Surgery
- Doctor of Philosophy
- DMD
- Doctor of Musical Arts
- Doctor of Divinity
- Doctor of Public Health
- Doctor of Optometry
- Doctor of Dental Medicine
- D.A.
- Doctor of Sacred Theology