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Dictionary definition for: Diaphragm

1. (n) a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically"

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

3. (n) 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

4. (n) electro-acoustic transducer that vibrates to receive or produce sound waves

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