- dither
- distemper
- dimness
- distinctness
- dropping
- drop_off
- declension
- decline in quality
- drippiness
- deflexion
- dissolubility
- deflection
- drop open
- drop down
- disengagement
- downslope
- declination
- doze off
- dope off
- drowse off
- drop out
- digitalis purpurea
- digitalis
- domestic pigeon
- dedication
- dervish
- dishwashing liquid
- druggery
- drug withdrawal
- decoagulant
- dosage
- Drixoral
- diaphoretic
- disulfiram
- depressant
- devil's claw
- drypis
- Dictamnus alba
- dittany
- dragonhead
- dock
- devil's fig
- Dicentra spectabilis
- Descurainia pinnata
- day lily
- deer's_ear
- devil's apples
- Diplotaxis muralis
- deadly nightshade
- draba