di·a·phragm /ˈdaɪəˌfræm/
 橫隔膜,控光裝置


 di·a·phragm /ˈdaɪəˌfræm/ 名詞
 隔膜,膈,光闌,膈膜


 Di·a·phragm n.
 1. A dividing membrane or thin partition, commonly with an opening through it.
 2. Anat. The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.
 3. Zool. A calcareous plate which divides the cavity of certain shells into two parts.
 4. Opt. 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. Mach. A partition in any compartment, for various purposes.
 Diaphragm pump, one in which a flexible diaphragm takes the place of a piston.

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 diaphragm
      n 1: a mechanical device in a camera that controls size of
           aperture of the lens; "the new cameras adjust the
           diaphragm automatically" [syn: stop]
      2: (anatomy) a muscular partition separating the abdominal and
         thoracic cavities; functions in respiration [syn: midriff]
      3: a contraceptive device consisting of a flexible dome-shaped
         cup made of rubber or plastic; it is filled with
         spermicide and fitted over the uterine cervix [syn: pessary,
          contraceptive diaphragm]
      4: electro-acoustic transducer that vibrates to receive or
         produce sound waves