diaphragm

n 1: controls size of aperture of the lens; "the new cameras

adjust the diaphragm automatically" [syn: {stop}]

2: (anatomy) a muscular partition separating the abdominal and

thoracic cavities; functions in respiration [syn: {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 [syn: {pessary},

{contraceptive diaphragm}]

4: vibrates to receive or produce sound waves