opacity

play
noun opac·i·ty \ō-ˈpa-sə-tē\

Definition of opacity

plural

opacities

  1. 1 a :  obscurity of sense :  unintelligibleness b :  the quality or state of being mentally obtuse :  dullness

  2. 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. 3 :  an opaque spot in a normally transparent structure (as the lens of the eye)


OPACITY Defined for English Language Learners

opacity

play
noun opac·i·ty \ō-ˈpa-sə-tē\

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

play
noun opac·i·ty \ō-ˈpas-ət-ē\

Medical Definition of opacity

plural

opacities

  1. 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. 2:  an opaque spot in a normally transparent structure (as the lens of the eye)



Seen and Heard

What made you want to look up opacity? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

an alert or lookout

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • alphabet-magnets
  • Which is the correct spelling?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ