n. a mechanical device in a camera that controls size of aperture of the lens
n. (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration
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
n. （机器等的）隔膜( diaphragm的复数形式 ); <解>膈; <物>光圈; （电话机、扬声器等的）膜片