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Dictionary

gray' mat"ter

1. Anat.nerve tissue, esp. of the brain and spinal cord, that contains fibers and nerve cell bodies and is dark reddish-gray. Cf. white matter.
2. Informal.brains or intellect.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

gray market

gray mold

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