doub - eart
- double acceptor
- double access
- double aperture method
- double arc
- double armature motor
- double armoured
- double band
- double barrier layer
- double battery switch
- double bell insulator
- double brace
- double bracket
- double bridge
- double bus
- double cassette deck
- double catenary equipment
- double cathode-ray tube
- double cell switch
- double circuit
- double circuit receiver
- double coating
- double coil
- double commutator motor
- double condenser
- double contact
- double contact wires
- double control
- double converter
- double crossed-loop aerial
- double current
- double cut-out
- double dash
- double data rate RAM
- double dead-ending
- double deflection
- double density
- double detent
- double diffused drain
- double diffusion
- double diode
