WordNet
n. greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons [syn: grey matter, gray matter, gray substance, substantia grisea]
Usage examples of "grey substance".
The great base of the central cone was fringed with a rubbery, grey substance which moved the whole entity through expansion and contraction.
Each pod had burst open in four or five places, a part of the grey substance that filled them spilling out onto the floor.
There was some pale grey substance, like fine gravel, mixed in with the purple-brown gumbo.
I opened it, dipped my finger inside and smeared a little of the grey substance inside onto my forehead, in a tiny V-shape just under my hairline, then replaced the vial and continued on my way.
The taste of his bitter cup stayed with him the rest of the day, although he had endeavoured to qualify it by eating lumps of an amorphous grey substance, said to be spoon-bread, a Southern delicacy.
For awhile the grey substance only managed to move a few inches or so out of the hole.
Garden paths in the future, he noted, were made of some gritty grey substance which was amazingly like cracked concrete.
From another small bag, a few pinches of a powdery grey substance.