- degassed water
- degassing tower
- degreasing agent
- dehydrated tar
- dehydration temperate
- dehydrogenation process
- deion gird
- deliming
- deliquescent
- deliver
- delivered capacity
- delivered current
- delivery mark
- delivery rime
- dell
- delphinine
- delrin
- delta connection
- delta iron
- delta lake
- delta metal
- delta shoreline
- deltaic deposit
- deasphalting
- decalcification
- decanol
- decanting trunk
- decay period
- decay rate
- declivity
- decomposing agent
- decomposition constant
- decomposition point
- decorative varnish
- deep karst
- deep spring
- deep-seated
- deepening
- deflation
- deflected well
- deflector
- defurring
- degassing station
- degerate
- decalcify
- decanter
- decanting glass
- decarboxylase
- decay coefficient
- decine
- decoking
- decolor
- decomposition
- decomposition heat
- decyl radical
- deep drilling
- deepen
- deflection point
- deflector plate
- deflocculating agent
- defoam
- degazolinage
- degreasing salt
- dehydrate
- dehydration process
- dehydrator
- dehydrogenize
- deicing agent
- delayed fracture
- demand factor
- demantoid
- demethanation
- demethanization
- demethylate
- demethylation
- demineralize
- demise charter
- demixing
- denaturalization
- denaturation
- dendritic structure
- dendroid
- dense shale
- density current
- density log
- dental wax
- dentifrice
- denude
- denuded zone
- deodorized naphtha
- deodorized oil
- deoiling
- deoiling petrolatum
- deoxidization
- deoxidizing addition
- departure curve
- dependability
- deplete
- depolarization
- depolarizing factor