- demotic
- demount
- demountable
- demountable room
- demulsify
- demulsifying agent
- demultiplexing
- demultiplier
- demux
- denaturation
- dendroid
- dendron
- dene
- denitrify
- denominate
- denominate number
- denotation
- denote
- dens
- dense brine
- dense soil
- denseness
- densimeter
- densiometer
- density balance
- density bottle
- density correction
- density function
- density gauge
- density modulation
- density ratio
- density transmitter
- dental follum
- dental sac
- dentate suture
- dentin
- dentine
- denude
- denuded mountain
- denumerable aggregate
- deny
- deodorization
- deodorize
- deoiling
- deoxidization
- deoxidize
- deoxidizer
- department head
- departure
- depend
- dependability
- dependable flow
- dependable yield
- dependence
- dependent code
- dependent event
- dependent segment
- dephasing
- dephasing angle
- depilation
- deplete
- depleted stock
- depletion mode
- depletion region
- depolarization
- deposit
- deposit gauge
- deposit metal
- deposited frost
- deposited matter
- deposited metal
- depositing concrete
- depositing tank
- deposition device
- deposition rate
- depositional gradient
- depository
- depot
- deprave
- depreciation expense
- depression depreciation
- depressor
- depressurize
- depth finder
- depth marker
- depth recorder
- derivation
- derivative feedback
- derived circuit
- derived energy
- derived module
- derrick
- derrick tower
- desalt
- descendant
- descending film
- descent path
- description
- descriptive model
- descriptor code