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Definition of diaphragm:

  1. A calcareous plate which divides the cavity of certain shells into two parts.
  2. A dividing membrane or thin partition, commonly with an opening through it.
  3. A partition in any compartment, for various purposes.
  4. A plate with an opening, which is generally circular, used in instruments to cut off marginal portions of a beam of light, as at the focus of a telescope.
  5. The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.


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