diaphragm
Definition from Wiktionary, the free dictionary
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English [edit]
Etymology [edit]
From Ancient Greek διάφραγμα (diáphragma, “partition”).
Pronunciation [edit]
Noun [edit]
diaphragm (plural diaphragms)
- (anatomy) In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs; also called thoracic diaphragm.
- (anatomy) Any of various membranes or sheets of muscle or ligament which separate one cavity from another.
- A contraceptive device consisting of a flexible cup, used to cover the cervix during intercourse.
- (mechanics) A flexible membrane separating two chambers and fixed around its periphery that distends into one or other chamber depending on the as the difference in the pressure in the chambers varies.
- (acoustics) In a speaker, the thin, semi-rigid membrane which vibrates to produce sound.
- (optics, photography) A thin opaque structure with a central aperture, used to limit the passage of light into a camera or similar device.
- (chemistry) A permeable or semipermeable membrane
- 1921, Wilder Dwight Bancroft, Applied Colloid Chemistry: General Theory[1], page 207:
- The mass of liquid transported through a porous diaphragm in a given time is directly proportional to the current.
- 1921, Wilder Dwight Bancroft, Applied Colloid Chemistry: General Theory[1], page 207:
- (construction) A floor slab, metal wall panel, roof panel or the like, havig a sufficiently large in-plane shear stiffness and sufficient strength to transmit horizontal forces to resisting systems.
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The thoracic diaphragm.
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A contraceptive diaphragm.
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A mechanical diaphragm.
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An acoustic diaphragm.
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Derived terms [edit]
Derived terms
Translations [edit]
anatomy: sheet of muscle separating thorax from abdomen
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anatomy: separating membrane or sheet of muscle
contraceptive device
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mechanics: flexible membrane
acoustics: vibrating membrane in a speaker
optics: structure with a central aperture used to limit the passage of light
chemistry: permeable or semipermeable membrane
construction: stiff floor slab etc.
- The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Help:How to check translations.
Verb [edit]
diaphragm (third-person singular simple present diaphragms, present participle diaphragming, simple past and past participle diaphragmed)
- (optics, photography) To reduce lens aperture using an optical diaphragm.
- 1870, D. Appleton & Co., Appletons' Annual Cyclopædia and Register of Important Events of the Year 1869[2], page 43:
- He employs an equatorial with an object-glass having a focal length of five metres, and which was diaphragmed down to eight centimetres.
- 1870, D. Appleton & Co., Appletons' Annual Cyclopædia and Register of Important Events of the Year 1869[2], page 43:
- To act as a diaphragm, for example by vibrating.
- 1996, Tom Drozda et al., Tool and Manufacturing Engineers Handbook, vol. VIII: Plastic Part Manufacturing[3], ISBN 0872630854, page 16-24:
- The holes and burning are caused by the part diaphragming at 20000-40000 cycles/second.
- 1996, Tom Drozda et al., Tool and Manufacturing Engineers Handbook, vol. VIII: Plastic Part Manufacturing[3], ISBN 0872630854, page 16-24:
Translations [edit]
optics: to reduce lens aperture
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