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diaphragm

Definition from Dictionary, a free dictionary
The sublimity of wisdom is to do those things living that are desired when dying.
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English

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Etymology

From Ancient Greek διάφραγμα (diáphragma), partition).

Pronunciation

  • IPA: /ˈdaɪəˌfræm/, SAMPA: /"daI@%fr{m/

Noun

Singular
diaphragm

Plural
{{{1}}}

diaphragm ({{{1}}})
  1. (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.
  2. (anatomy) Any of various membranes or sheets of muscle or ligament which separate one cavity from another.
  3. A contraceptive device consisting of a flexible cup, used to cover the cervix during intercourse.
  4. (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.
  5. (acoustics) In a speaker, the thin, semi-rigid membrane which vibrates to produce sound.
  6. (optics, Template loop detected: Template:context 1) A thin opaque structure with a central aperture, used to limit the passage of light into a camera or similar device.
  7. (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.

Derived terms

Translations



Verb

Infinitive
to diaphragm

Third person singular
-

Simple past
-

Past participle
-

Present participle
-

to diaphragm (third-person singular simple present -, present participle -, simple past and past participle -)
  1. (optics, Template loop detected: Template:context 1) 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.
  2. 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.

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