Dictionary

gray matter

noun

: the tissue that makes up the brain

Full Definition of GRAY MATTER

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

Examples of GRAY MATTER

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

First Known Use of GRAY MATTER

1840
Medical Dictionary

gray matter

noun

Medical Definition of GRAY MATTER

:  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

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