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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.
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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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.