• noun:   a mechanical device in a camera that controls size of aperture of the lens

  Example: "The new cameras adjust the diaphragm automatically"

• noun:   electro-acoustic transducer that vibrates to receive or produce sound waves
• noun:   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
• noun:   (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration

Related words...