opacities

Noun

opacity (countable and uncountable, plural opacities)

1. (uncountable) The state or quality of being opaque, not allowing light to pass through.
   • We could not see the sandbar due to the opacity of the muddy water.

   Synonyms:

   opaqueness, nontransparency

   Antonyms:

   clarity, clearness, translucency, transparency

2. (uncountable) The state or quality of being inaccessible to understanding.
   • The opacity of these decisions is troubling.

   Antonyms:

   clarity, lucidity

3. (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.
   • 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.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