- photodarkening in gain fiber
- photodecomposition
- photodegradable
- photodegradation
- photodegradation of polymer
- photo Dember effect
- photo-Dember effect
- photodensitometer
- photodensitometry
- Photo Department of the Kuomintang Central News Agency
- photodepolarization
- photodeposition
- photodestruction
- photodetachment
- photo detection
- photodetection
- photodetection, photoelectric detection
- photo detector
- photodetector
- photodeuteron
- photo diary
- photodichroic
- photodichroism
- photodielectric effect
- photodiffusion