Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

gray matter

noun

Simple Definition of gray matter

  • : the tissue that makes up the brain

Source: Merriam-Webster's Learner's Dictionary

Full Definition of gray matter

  1. 1 :  neural tissue especially of the brain and spinal cord that contains nerve-cell bodies as well as nerve fibers and has a brownish-gray color

  2. 2 :  brains, intellect

Examples of gray matter in a sentence

  1. <she's got the gray matter to figure that equation out>



1840

First Known Use of gray matter

1840


Medical Dictionary

gray matter

noun

Medical Definition of gray matter

  1. :  neural tissue especially of the brain and spinal cord that contains cell bodies as well as nerve fibers, has a brownish gray color, and forms most of the cortex and nuclei of the brain, the columns of the spinal cord, and the bodies of ganglia—called also gray substance




Learn More about gray matter


Seen and Heard

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

WORD OF THE DAY

in the capacity or character of

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

fox-in-summer-forest

Which of these is a synonym of inchoate?

frightening massive experimental formless
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