Medical Dictionary


noun opac·i·ty \ō-ˈpas-ət-ē\
plural opac·i·ties

Medical Definition of OPACITY

:  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)
:  an opaque spot in a normally transparent structure (as the lens of the eye)


How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears