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Diaphragm (Ancient Greek: διάφραγμα diáphragma “partition”) may refer to any of the following:
Optics and photography
- Diaphragm (optics), a stop in the light path of a lens, having an aperture that regulates the amount of light that passes
- Diaphragm shutter, a type of leaf shutter consisting of a number of thin blades in a camera
- Diaphragm (acoustics), a thin, semi-rigid membrane that vibrates to produce or transmit sound waves
- Thoracic diaphragm, a thin sheet of muscle under the lungs
- Pelvic diaphragm, also called pelvic floor, a pelvic structure
- Urogenital diaphragm, also called the tribangular ligament, a pelvic structure
- Diaphragm (contraceptive), a small rubber dome placed in the vagina to wall off the cervix, thus preventing sperm from entering
- Diaphragm (mechanical device), a sheet of a semi-flexible material anchored at its periphery
- Diaphragm seal, a membrane that seals an enclosure
- Diaphragm pump, a type of pump
- Diaphragm arch, a type of arch
- Diaphragm wall, a type of wall
- Diaphragm valve, a type of valve
- Diaphragm (structural system), a structural engineering system used to resist lateral loads
- Diaphragm, another name for a separator in electrochemical systems.
- Diaphragma a genus of algae.
- Diaphragm, an accordionlike device enclosing a gangway connection between two railway coaches/cars
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