Diaphragm

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A diaphragm is some sort of separating membrane. This gives rise to several meanings:

diaphragm (acoustics), a thin, semi-rigid membrane attached to the central magnet that produces sound in a loudspeaker
diaphragm (anatomy), a shelf of muscle extending across the bottom of the ribcage of mammals
diaphragm (contraceptive), a small rubber dome placed in the vagina to wall off the cervix, thus preventing sperm from entering
diaphragm (mechanics), a sheet of a semi-flexible material anchored at its periphery
diaphragm seal, a membrane that seals an enclosure
diaphragm (optics), an opening in the lightpath of a lens or objective that can regulate the amount of light that passes