opacity

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noun opac·i·ty \ ō-ˈpa-sə-tē \

Definition of opacity

plural opacities
1 a :obscurity of sense :unintelligibility
b :the quality or state of being mentally obtuse :dullness
2 :the quality or state of a body that makes it impervious to the rays of light; broadly :the relative capacity of matter to obstruct the transmission of radiant energy
3 :an opaque spot in a normally transparent structure (such as the lens of the eye)

Examples of opacity in a Sentence

  1. the opacity of the glass

  2. Critics have noted the opacity of her writing style.

Recent Examples of opacity from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'opacity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of opacity

Middle French opacité shadiness, from Latin opacitat-, opacitas, from opacus shaded, dark


OPACITY Defined for English Language Learners

opacity

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noun

Definition of opacity for English Language Learners

  • : the quality of a material that does not allow light to pass through it : the quality of being opaque

  • : the quality of being difficult to understand or explain


Medical Dictionary

opacity

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noun opac·i·ty \ ō-ˈpas-ət-ē \

medical Definition of opacity

plural opacities
1 :the quality or state of a body that makes it impervious to the rays of light; broadly :the relative capacity of matter to obstruct by absorption or reflection the transmission of radiant energy (as X-rays, infrared radiation, or sound)
2 :an opaque spot in a normally transparent structure (as the lens of the eye)


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