definition of
[diaphragm]

[1] #1 diaphragm n. [stop] a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically". wn

[2] #2 diaphragm n. [midriff] (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration. wn

[3] #3 diaphragm n. [pessary, contraceptive 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. wn

[4] #4 diaphragm n. electro-acoustic transducer that vibrates to receive or produce sound waves. wn