| grey matter | |
| —n | |
| 1. | Compare white matter Technical name: substantia grisea the greyish tissue of the brain and spinal cord, containing nerve cell bodies, dendrites, and bare (unmyelinated) axons |
| 2. | informal brains or intellect |
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| a chattering or flighty, light-headed person. |
| a fool or simpleton; ninny. |
| grey matter | |
noun | |
| greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons |