iris diaphragm

/ˌaɪrɪs ˌdaɪəˈfræm/
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Definitions of iris diaphragm
  1. noun
    diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
    synonyms: iris
    see moresee less
    type of:
    diaphragm, stop
    a mechanical device in a camera that controls size of aperture of the lens
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