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gray matter

n :  neural tissue esp. 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  .
Similar sounding terms:  cre·ma·to·ry  hy·grom·e·ter  hy·grom·e·try 

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