color zone


Definition of color zone

in some theories of vision
: one of the three concentric areas of the retina as distinguished on the basis of their color sense, the outer zone giving practically only the grays, the intermediate zone adding yellow and blue, and the central zone adding red and green so that only the central zone is sensitive to all colors

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Learn More about color zone

Statistics for color zone

Cite this Entry

“Color zone.” Dictionary, Merriam-Webster, Accessed 16 Jan. 2021.

Comments on color zone

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


Test Your Vocabulary

Words of Snow and Ice Quiz

  • image1037863653
  • Which of the following refers to thin, bending ice, or to the act of running over such ice?
True or False

Test your knowledge - and maybe learn something along the way.


Anagram puzzles meet word search.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!