?da??fræm n. 1 a muscular partition separating the thorax from the abdomen in mammals. 2 a partition in animal and plant tissues. 3 a disc pierced by one or more holes in optical and acoustic systems etc. 4 a device for varying the effective aperture of the lens in a camera etc. 5 a thin contraceptive cap fitting over the cervix. 6 a thin sheet of material used as a partition etc. ødiaphragm pump a pump using a flexible diaphragm in place of a piston. øødiaphragmatic adj. [ME f. LL diaphragma f. Gk (as DIA-, phragma -atos f. phrasso fence in)]
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