Gray degeneration
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.
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noun 1. any of several ducks in which certain immature or female plumages are predominantly gray, as the gadwall and the pintail.
- Gray-eminence
noun 1. a person who wields unofficial power, especially through another person and often surreptitiously or privately.
- Grayer
[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.
- Grayfish
[grey-fish] /ˈgreɪˌfɪʃ/ noun, plural grayfishes (especially collectively) grayfish. 1. a name used in marketing for any of several American sharks, especially the dogfishes of the genus Squalus.