- deep-waterline
- deepening
- deepsleek
- default directory
- default option
- default printer
- default value
- defecate
- defecator
- defective
- defense line
- deferred addressing
- deferred processing
- deferred share
- deficiency
- deficient
- define
- definitive
- definitive project
- deflagrate
- deflate
- deflation
- deflecting circuit
- deflecting magnet
- deflecting plate
- deflection method
- deflection tube
- deflective
- deflector
- deflexion
- defluxion
- defocused picture
- deformable joint
- deformation
- deformation energy
- deformation gap
- deformation thermometer
- deformed bar
- deformeter
- defray
- defrost action
- defrost water
- defrosting
- defrosting liquid
- defrosting procedure
- degenerate electron
- degenerative
- degradation failure
- degree centigrade
- decade bridge
- decal
- decalcify
- decantation
- decanter
- decanting glass
- decarbonate
- decarbonise
- decay coefficient
- decay factor
- decay protection
- decay time
- decaying particle
- deceleration device
- deceleration land
- decelerative force
- decentralized network
- decibel meter
- decimal base
- decimal code
- decimal constant
- decimal fraction
- decimal marker
- decine
- decipher
- decision making
- Decision theory
- deck
- deck clip
- deckle board
- declination variometer
- declutch
- decode
- decoding circuit
- decolor
- decolorising
- decolorizer
- decompiler
- decomposed
- decomposes curve
- decomposition
- decomposition heat
- decompression
- decontaminate
- decorated light
- decoration
- decorative bond
- decorative design
- decorative glass
- decorative painting
- decorative work