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diaphragm
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English Dictionary: diaphragm by the DICT Development Group
2 results for diaphragm
From WordNet (r) 3.0 (2006) [wn]:
diaphragm
n
  1. a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically"
    Synonym(s): diaphragm, stop
  2. (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration
    Synonym(s): diaphragm, 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
    Synonym(s): diaphragm, pessary, contraceptive diaphragm
  4. electro-acoustic transducer that vibrates to receive or produce sound waves
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Diaphragm \Di"a*phragm\, n. [L. diaphragma, Gr. [?], fr. [?] to
      fence by a partition wall; dia` through + [?], [?], to fence,
      inclose; prob. akin to L. fareire to stuff: cf. F.
      diaphragme. See {Farce}.]
      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. (Zo[94]l.) 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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