1. A mechanical device in a camera that controls size of aperture of the lens
   "the new cameras adjust the diaphragm automatically"
   - stop 
2. (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration
   - midriff 
3. 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
   - pessary, contraceptive diaphragm 
4. Electro-acoustic transducer that vibrates to receive or produce sound waves

Derived forms: diaphragms

See also: phrenic

Type of: birth control device, contraceptive, contraceptive device, disc, disk [N. Amer], mechanical device, membrane, muscle system, muscular structure, musculature, preventative, preventive, prophylactic device, tissue layer

Part of: body, camera, electro-acoustic transducer, photographic camera, torso, trunk

Encyclopedia: Diaphragm

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