or gray scale
a scale of achromatic colors having several, usually ten, equal gradations ranging from white to black, used in television and photography.
Origin of grayscale
First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.