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grayscale

or gray scale

[grey-skeyl]
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noun
  1. 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. 2018
gray scale in Medicine

gray scale

n.
  1. Gray-scale ultrasonography.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.