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diaphragm British & World English

A dome-shaped muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs

diaphragm pump British & World English

A pump using a flexible diaphragm in place of a piston

iris diaphragm in iris British & World English

An adjustable diaphragm of thin overlapping plates for regulating the size of a central hole, especially for the admission of light to a lens

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