diaphragm in WordNet English dictionary

1. a contraceptive device consisting of a flexible dome-shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix
   diaphragm  pessary  contraceptive diaphragm 
   
2. a mechanical device in a camera that controls size of aperture of the lens
   "the new cameras adjust the diaphragm automatically"
   diaphragm  stop 
   
3. electro-acoustic transducer that vibrates to receive or produce sound waves
   diaphragm 
   
4. (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration
   diaphragm  midriff