American English

Definition of diaphragm noun from the Oxford Advanced American Dictionary



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  1. 1(anatomy) the layer of muscle between the lungs and the stomach, used especially to control breathing
  2. 2a rubber or plastic device that a woman places inside her vagina before having sex to prevent sperm from entering the womb and making her pregnant
  3. 3a device that controls the amount of light that enters a camera
  4. 4(technology) a thin disk used to turn electronic signals into sound, and sound into electronic signals in telephones, loudspeakers, etc.
See the Oxford Advanced Learner's Dictionary entry: diaphragm