diaphragm

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.

(anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration.

A mechanical device in a camera that controls size of aperture of the lens.

“the new cameras adjust the diaphragm automatically”

Electro-acoustic transducer that vibrates to receive or produce sound waves.