The degeneration of the white substance of the spinal cord, the fibers of which lose their myelin sheaths and become darker in color.
Grey vs Gray
Grey and gray are both accepted in the English language. They refer to a color of a neutral tone between black and white, and can also be used metaphorically to convey gloom and dullness. However, gray is the more popular spelling in the US, while grey reigns supreme in the UK. For centuries, the one letter difference between gray and grey has left people wondering …
What does 🐿️ - Chipmunk Emoji mean?
Read more in this article about some frequently asked questions and fun facts related to our definitions.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.