| noun | a mechanical device in a camera that controls size of aperture of the lens “the new cameras adjust the diaphragm automatically” |
| noun | (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration |
| 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 | electro-acoustic transducer that vibrates to receive or produce sound waves |