- dual processor
- dual theorem
- dual-current
- dualistic
- duality
- duality principle
- dubbing
- dubbing room
- dubbing studio
- ducite
- duct
- ducted fan
- ductile rupture
- ductility index
- ductus
- Duddell oscillograph
- due
- dues
- duet
- dug hole
- dukey
- dull
- dull glass
- dumb arch
- dummy
- dummy argument
- dummy club
- dummy joint
- dummy load
- dummy piston
- dump area
- dump car
- dump test
- dump truck
- dump valve
- dumped fill
- dumped riprap
- dung
- duplex apartment
- duplex cable
- duplex channel
- duplex circuit
- duplex connection
- duplex house
- duplexer
- duplicate
- duplicating attachment
- duplicator
- durability factor
- durable
- duraluminium
- duration control
- duration curve
- duricrust
- durometer hardness
- dust allayer
- dust avalanche
- dust box
- dust catcher
- dust chamber
- dust coal
- dust collector
- dust control
- dust counter
- dust cover
- dust extractor
- dust layer
- dust load
- dust mask
- dust particle
- dust rain
- dust removal
- dust screen
- dust scrubber
- dynamic routing
- dynamic scheduling
- dynamic sensitivity
- dynamic stop
- dynamic storage
- dynamic strength
- dynamic viscosity
- dynamical
- dynamical electricity
- dynamical memory
- dynamical programming
- dynamical stability
- dynamics
- dynamiting
- dynamo
- dynamoelectric
- dynamometer
- dynamometer brake
- dynamotor
- dynatron oscillator
- dyscrinism
- dysendocrisiasis
- dyshidrosis
- dyshormonism
- dysphotic zone
- dyssmmetry