英和和英

発音

• (米国発音) enPR: ōpăsʹĭti, IPA: /oʊˈpæsɪti/

名詞

opacity (countable and uncountable, plural opacities)

1. (uncountable) The state or quality of being opaque, not allowing light to pass through.

   Synonyms: opaqueness, nontransparency

   Antonyms: clarity, clearness, translucency, transparency

   We could not see the sandbar due to the opacity of the muddy water.

2. (uncountable) The state or quality of being inaccessible to understanding.

   Antonyms: clarity, lucidity

   The opacity of these decisions is troubling.

3. (optics, countable) A measure of relative impenetrability to electromagnetic radiation such as light.

   The opacity of a clean glass window is near zero.

4. (countable) An opaque area.
   • 1968, Dark A. J., Kirkham T. H., “Congenital corneal opacities in a patient with Rieger's anomaly and Down's syndrome”, in British Journal of Ophthalmology, volume 52, number 8, →DOI, page 631:

     This report concerns a child with Down's syndrome (mongolism) and bilateral congenital corneal opacities born into a family affected through three generations by Rieger's anomaly.

   • 1992, Dick, J. A. et al., “The significance of irregular opacities on the chest roentgenogram”, in Chest, volume 102, number 1, →DOI, →PMID, pages 251-60:

     Scanty irregular opacities are not uncommonly observed on the chest roentgenogram in the absence of interstitial fibrosis of the lungs.

等位語

• transparency

派生語