white matter

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white matter

the whitish tissue of the brain and spinal cord, consisting mainly of myelinated nerve fibres
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
"One of the parents at the panto noticed a white substance under her nose and asked what it was.
Orange pith, the white substance between the peel and the flesh, is high in fiber.
Sixteen bags of white powder were recovered in the raid, as well as a solid block of a white substance. Tests later found it to be cocaine.
Henna Sajid said she noticed the white substance had floating in her glass just before she went to take a sip.
Myelin, a fatty white substance surrounding axons (the wires connecting brain cells), enables fast communication between brain cells.
When the officers spoke with Hurley they also noticed a small bag containing a white substance next to the driver's seat.
District Chief DiLiddo requested a Tier 1 response from the state Department of Fire Services hazardous materials response team to help assess how dangerous the white substance was.
It is believed a white substance was dumped in the water on Wednesday night in the Hepple Way area of Gosforth causing the colour change and the Environment Agency said it had not ruled out the possibility that the pollutant had been dumped illegally.
The council's waste management team will inspect and clear the coastline in Ogmore daily until the white substance stops appearing.
The victims were left with a white substance on their skin and were being treated in a basic hospital, the report added.
The solid white substance burns with a pale flame, leaving nothing but water.