Online Google Dictionary

attenuate 中文解釋 wordnet sense Collocation Usage Collins Definition
Adjective
/əˈtenyo͞oˌāt/,
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attenuated, past participle; attenuates, 3rd person singular present; attenuating, present participle; attenuated, past tense;
  1. Reduced in force, effect, or physical thickness

Verb
  1. Reduce the force, effect, or value of
    • - her intolerance was attenuated by a rather unexpected liberalism
  2. Reduce the amplitude of (a signal, electric current, or other oscillation)

  3. (of a signal, electric current, or other oscillation) Be reduced in amplitude

  4. Reduce the virulence of (a pathogenic organism or vaccine)
    • - attenuated strains of rabies virus
  5. Reduce in thickness; make thin
    • - the trees are attenuated from being grown too close together
  1. reduced in strength; "the faded tones of an old recording"
  2. rarefy: weaken the consistency of (a chemical substance)
  3. become weaker, in strength, value, or magnitude
  4. (attenuated) of an electrical signal; reduced in amplitude with little or no distortion
  5. (attenuation) weakening in force or intensity; "attenuation in the volume of the sound"
  6. (attenuation) the property of something that has been weakened or reduced in thickness or density
  7. In physics, attenuation (in some contexts also called extinction) is the gradual loss in intensity of any kind of flux through a medium. For instance, sunlight is attenuated by dark glasses, X-rays are attenuated by lead, and light and sound are attenuated while passing through water.
  8. (Attenuation (biology)) The attenuator plays an important regulatory role in prokaryotic cells because of the absence of the nucleus in prokaryotic organisms. ...
  9. (Attenuation (brewing)) Attenuation is the percentage that measures the conversion of sugars into alcohol and CO2 by the fermentation process. The percentage is calculated by comparing weight or specific gravity of the extract before and after fermentation.
  10. (Attenuation (electronics)) An attenuator is an electronic device that reduces the amplitude or power of a signal without appreciably distorting its waveform.
  11. (Attenuation (statistics)) Regression dilution is a statistical phenomenon also known as "attenuation".
  12. To reduce in size, force, value, amount, or degree; To weaken; To rarefy; To reduce the virulence of a bacteria or virus; (electronics) To reduce the amplitude of an electrical signal; Gradually tapering into a petiole-like extension toward the base
  13. (attenuated) Made, or become weak; subject to attenuation; Long and tapering (especially of leaves)
  14. (attenuation) A gradual diminishing in the strength of something; A reduction in the level of some property with distance, especially the amplitude of a wave or the strength of a signal; A weakening in the virulence of a pathogen or other microorganism; The tapering of a leaf etc to a fine ...
  15. An attenuated vaccine is one that has been weakened by chemicals or other processes so that it will produce an adequate immune response without causing the serious effects of an infection.
  16. (attenuated) Weakened or thinned. Attenuated strains of disease-causing bacteria and viruses are often used as vaccines. The weakened strains are used as vaccines because they stimulate a protective immune response while causing no disease or only mild disease in the person receiving the vaccine.
  17. (Attenuated) Weakened or decreased. For example, an attenuated virus can no longer produce disease but might be used to produce a vaccine.
  18. (Attenuated) Weakened; in vaccines, the weakening of a virus or bacteria to disable its ability to cause disease
  19. (Attenuated) Gradual tapering base of a leaf, analogous to acuminate in a leaf tip. Contrasts with cuneate leaf bases which taper abruptly.
  20. (Attenuated) Made thin or slender in girth or transverse thickness; tapered off (see Stauroneis anceps)
  21. (attenuated) [ah ten´ you a ted]   Weakened; referring to virus, it means the virus is no longer infectious.
  22. (attenuated) a term to describe wine that tastes dilute, associated with overcropped vines.
  23. (attenuated) weakened or treated in such a way as to decrease the ability of a microorganism (such as parasite or virus) to cause infection or disease.
  24. (Attenuating) Reducing the energy of the radiation beam.
  25. (Attenuation) The decrease in the power of a signal, light beam, or light wave. Measured in decibels. Opposite of gain.