Definitions for: Diaphragm


[n] a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically"
[n] electro-acoustic transducer that vibrates to receive or produce sound waves
[n] 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
[n] (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration



Webster (1913) Definition: 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["o]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.

Synonyms: contraceptive diaphragm, midriff, pessary, stop

See Also: birth control device, body, camera, contraceptive, contraceptive device, disc, disk, electro-acoustic transducer, iris, iris diaphragm, mechanical device, membrane, muscle system, muscular structure, musculature, photographic camera, preventative, preventive, prophylactic device, tissue layer, torso, trunk

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