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n (anatomy) In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs; also called thoracic diaphragm.

n (anatomy) Any of various membranes or sheets of muscle or ligament which separate one cavity from another.

n A contraceptive device consisting of a flexible cup, used to cover the cervix during intercourse.

n (mechanics) A flexible membrane separating two chambers and fixed around its periphery that distends into one or other chamber depending on the as the difference in the pressure in the chambers varies.

n (acoustics) In a speaker, the thin, semi-rigid membrane which vibrates to produce sound.

n (optics|photography) A thin opaque structure with a central aperture, used to limit the passage of light into a camera or similar device.

n (chemistry) A permeable or semipermeable membrane

n (context|construction) A floor slab, metal wall panel, roof panel or the like, havig a sufficiently large in-plane shear stiffness and sufficient strength to transmit horizontal forces to resisting systems.

v (optics|photography) To reduce lens aperture using an optical diaphragm.

v To act as a diaphragm, for example by vibrate | vibrating.