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1. Oxford American Dictionary

   diaphragm

   • IPA[ˈdīəˌfram]

   美式

   • n.
     a dome-shaped muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs.；a thin sheet of material forming a partition.

   • noun: diaphragm, plural noun: diaphragms

2. • 釋義

   n.

   名詞

   • 1. a dome-shaped muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs.
   • 2. a thin sheet of material forming a partition.
   • ▪ a taut flexible membrane in mechanical or acoustic systems.
   • 3. a thin contraceptive cap fitting over the cervix.
   • 4. a device for varying the effective aperture of the lens in a camera or other optical system.