Swiss ballˌSwiss ˈball noun [countable] trademark 
a large plastic ball that you sit on or lie against in order to do special exercises
a large plastic ball that you sit on or lie against in order to do special exercises- phosphorus
- photo
- photo-
- photobombing
- photo booth
- photocall
- photocopier
- photocopy
- photocopying
- photoelectric
- photoelectric cell
- photo finish
- Photofit
- photogenic
- photograph
- photographer
- photographic
- photographically
- photographic memory
- photography
- photojournalism
- photon
- photo opportunity
- Photorealism
- photosensitive