door - drop
- door
- door arch
- door bank
- door extractor
- door frame
- door leak
- door lifter
- door man
- door switch
- door-extraction travel
- door-lifting mechanism
- door-machine track
- doorframe
- doorman
- doorplate
- dop
- Dored process
- dormant scrap
- dose-rate meter
- dosifilm
- dosimetry probe
- dosing furnace
- dosing mechanism
- dosing tank
- dosing weighing device
- dot-and-dash line
- dotted line
- double
- double (curved-crystal) monochromator
- double ageing
- double aging
- double arc
- double bel-and-hopper arrangement
- double bell-and-hopper arrangement
- double bounce
- double casthouse
- double coating of film
- double coil holder arrangement
- double contraction
- double cooling bank
