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(noun) stop
a mechanical device in a camera that controls size of aperture of the lens
the new cameras adjust the diaphragm automatically
(noun) contraceptive diaphragm, pessary
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) midriff
(anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration