| DOPP | a ghostly double of a living person that haunts its living counterpart |
|---|---|
| DOPP | a unit of weight equal to 100 kilograms |
| DOPP | Austrian physicist famous for his discovery of the Doppler effect (1803-1853) |
| DOPP | change in the apparent frequency of a wave as observer and source move toward or away from each other |
| DOPP | change in the apparent frequency of a wave as observer and source move toward or away from each other |