Oxford Dictionary English

    diaphragm

    noun
    noun
    BrE BrE//ˈdaɪəfræm//
    ; NAmE NAmE//ˈdaɪəfræm//
    Internal anatomy
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  1. 1 (anatomy) the layer of muscle between the lungs and the stomach, used especially to control breathing See related entries: Internal anatomy
  2. 2(British English also cap) a 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. 3any thin piece of material used to separate the parts of a machine, etc.
  4. 4(specialist) a thin disc used to turn electronic signals into sound and sound into electronic signals in telephones, loudspeakers, etc.
    5.  Word Originlate Middle English: from late Latin diaphragma, from Greek, from dia ‘through, apart’ + phragma ‘a fence’.
See diaphragm in the Oxford Advanced American Dictionary
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