Ultrasonography that displays small differences in an acoustical impedance as if they were different shades of gray.
Grey vs. GrayGrey 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 as well as Ireland, Australia, and other places that use British English. For centuries, …
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.