Medical Definition of opacity
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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Dictionary: Definition of "opacity" Thesaurus: All synonyms and antonyms for "opacity" Spanish Central: Translation of "opacity" Nglish: Translation of "opacity" for Spanish speakers Britannica English: Translation of "opacity" for Arabic speakers Britannica.com: Encyclopedia article about "opacity"
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