- diffuse sound
- diffused-sound
- diffusibility
- diffusing glass
- diffusion behavior
- diffusion welding
- diffusion well
- diffusivity
- dig
- digger
- digging bucket
- digging cycle
- digging depth
- digging tool
- dignify
- dike design
- dilatancy
- dilatation joint
- dilettante
- diligent
- diluted bitumen
- dilution
- diluvium
- diluvium soil
- dime novel
- dimension
- dimension measure
- dimension shingles
- dimensional
- dimensional base
- dimensional number
- dimensional outline
- dimetric projection
- diminished arch
- diminished image
- diminished stile
- dinamic unbalance
- dinas
- dinas brick
- dinghy
- dining hall
- dining kitchen
- dinosaur
- diocese
- diorite
- dip
- dip brazing
- dip line
- dip siphon
- dip stick
- DIP switch
- depreciation charges
- depreciation fund
- Depreciation rate
- depressed shell
- depression
- derail
- derrick boat
- derrick mast
- descender
- descriptor dictionary
- deselect
- desensitize
- desert region
- design activity
- design capacity
- design chart
- design development
- design document
- design head
- design institute
- design life
- design line
- design notes
- design pitch
- design refusal
- design spacing
- design system
- design truck
- designer draftsman
- desktop pattern
- destination document
- destruction stage
- detached dwelling
- detailed investigation
- detective
- detention tank
- detonation
- detritus chamber
- deturn
- devalue
- developable surface
- dew-point
- dewatered sludge
- dexterous
- diabase schist
- diadem
- diaglyph
- diagonal buttress
- diagonal rib