gray degeneration n.
The degeneration of the white substance of the spinal cord, the fibers of which lose their myelin sheaths and become darker in color.
noun 1. any of several ducks in which certain immature or female plumages are predominantly gray, as the gadwall and the pintail.
noun 1. a person who wields unofficial power, especially through another person and often surreptitiously or privately.
[grey] /greɪ/ adjective, grayer, grayest. 1. of a color between white and black; having a neutral hue. 2. dark, dismal, or gloomy: gray skies. 3. dull, dreary, or monotonous. 4. having gray hair; gray-headed. 5. pertaining to old age; mature. 6. Informal. pertaining to, involving, or composed of older persons: gray households. 7. old or […]
- Gray fiber
gray fiber n. See unmyelinated fiber.