- dioptric
- diorite
- dioxide
- dip
- dip angle
- dip coating
- dip compass
- dip fault
- dip gauge
- dip heading
- dip mold
- dip pipe
- DIP socket
- dip steep
- DIP switch
- dip tank
- dip trap
- dip up
- dip view
- diphase
- diphasic
- depot-refrigerator
- depress
- depressed
- depression
- depression cone
- depressurization valve
- dept measurement
- depth indicator
- depth measurement
- depth survey
- deracinate
- derating factor
- derbyshire spar
- deresinify
- derivation graph
- derived
- derrick drill
- desalinization
- desalting
- desaturate
- descend
- descending curing
- descending line
- descent
- desemulsify
- desiccate
- desiccation fissure
- desiccator
- design architect
- design capacity
- design conception
- design cost
- design development
- design feature
- design flow
- design force
- design heuristic
- design life
- design paper
- design position
- design schedule
- design specifications
- designation
- designed stress
- desilicanization
- desilting
- desilverizing
- desired
- desk accessory
- desktop application
- desorption
- despin
- despin system
- desroption
- destacking
- destination
- destine
- destruct charge
- destructive memory
- destructive testing
- destructor
- desulfurization
- desulfuzire
- detached
- detail
- detail chart
- detail flowchart
- detailed design
- detecting diode
- detecting relay
- detection threshold
- detent pawl
- detention basin
- deteriorate
- deterioration failure
- determination
- detonating cap
- detonating explosives
- detonation