Diaphragm

n. partition separating the chest cavity from the abdomen (Anatomy); disk which vibrates in response to sound waves (in a telephone, speaker, etc.); shutter; birth control device

Diaphragm may refer to:AnatomyThoracic diaphragm, a sheet of muscle separating the thorax and abdomen of mammalsUrogenital diaphragm, a layer of the pelvis separating deep perineal sac from the upper pelvisPelvic diaphragm, a pelvic muscle consisting of the Levator ani and the Coccygeus A number of structures that act as diaphragms, including the iris and the eardrumAny dividing structure; for example, in gasteromycetes and bryozoans, with a sense similar to that of septum
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Diaphragms are dome-shaped barrier methods of contraception that block sperm from entering the uterus. [more]Diaphragm - Community and Resources

Noun
1. a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically"
(synonym) stop
(hypernym) mechanical device
(hyponym) iris, iris diaphragm
(part-holonym) camera, photographic camera
2. (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration
(synonym) midriff
(hypernym) muscular structure, musculature, muscle system
(part-holonym) torso, trunk, body
(classification) anatomy, general anatomy
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) pessary, contraceptive diaphragm
(hypernym) contraceptive, preventive, preventative, contraceptive device, prophylactic device, birth control device
4. electro-acoustic transducer that vibrates to receive or produce sound waves
(hypernym) disk, disc
(part-holonym) electro-acoustic transducer

(n.)
The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.
  

(n.)
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.
  

(n.)
A partition in any compartment, for various purposes.
  

(n.)
A dividing membrane or thin partition, commonly with an opening through it.
  

(n.)
A calcareous plate which divides the cavity of certain shells into two parts.