- debutanizing process
- decahydronaphthalene
- decalin
- decane
- decantation vessel
- decanting machine
- decarbonization
- decay circuit
- decay heat
- decinene
- declination
- decompose
- decomposition value
- decopper
- decyne
- deep level
- defect structure
- deflation lake
- deflocculate
- defoaming agent
- deformation texture
- degeneration
- degradation
- degrade
- degreasing
- dehydrated
- dehydrated oil
- dehydrating agent
- dehydration plant
- dehydration tank
- dehydration water
- dehydrogenate
- dehydrogenation
- dehydrogenation unit
- deionization
- dekaline
- delayed explosion
- deleterious
- Damascus steel
- dammar
- dammed lake
- damouritization
- damp
- damp sheet
- damped
- dampening solution
- damping device
- Danckwerts model
- dangerous material
- daphnetin
- dart valve
- datum horizon
- datum plane
- davyne
- de-ethanation
- dead arm
- dead rock
- deacidising
- dead air
- dead catalyst
- dead freight
- dead level
- dead loss
- dead oil
- dead soil
- deashing
- deasphaltic oil
- debutanisation
- decant
- decanting pit
- decarbonisation
- decene
- decline curve
- decontamination
- decorative laminate
- decorative plastic
- decree
- decrepitation
- decyl
- deduster
- deep borer
- damping factor
- damposcope
- daphnin
- dart bailer
- date line
- datissosid
- Deacon process
- deactivate
- dead burned
- dead color
- dead man
- deasphaalt
- deasphalting process
- debris slide
- debutanised
- deflecting tool
- deflector brattice
- deflocculated graphite
- deflocculation