- divisor
- divorce
- divulge
- DMA bus
- dock
- docking adaptor
- document type
- doensand
- dog chuck
- dog clutch
- dog iron
- dog spike
- dog-nail
- dogleg stair
- dogleg stairs
- dolomite
- domain
- domal flank
- dome
- dome brick
- dome fold
- dome nut
- dome roof
- domed
- domed roof
- domestic
- domestic boiler
- domestic coal
- domestic freezer
- domestic garbage
- domestic house
- domestic supply
- domestic water
- domical vault
- dominance
- dominant cation
- dominant function
- done
- donee
- dongle
- donjon
- donkey man
- donkey-engine
- donor
- donor atom
- donor country
- door
- door catch
- door glass
- door jolt
- door knob
- door leaf
- door leaves
- door lock
- door pillar
- doorsill
- dopant
- dope
- dope mark
- doped junction
- doped semiconductor
- Doppler effect
- Doppler radar
- Doppler sonar
- dorsoposterior
- dorsum
- dosage
- dose equivalent
- dose meter
- dose recorded
- dosimeter
- dosing
- dossier
- dot chart
- dot gain
- dot grating
- doted
- dotted curve
- dotted line
- doty
- double amplitude
- double bevel
- double bridge
- double buffer
- double character
- double column
- double conductor
- double coset
- double crossover
- double cut
- double door
- double frame
- double joint
- double layer
- double pitch
- double plane
- double pole
- double pump
- double refracting
- double room