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duotype

[doo-uh-tahyp, dyoo-]
noun Printing.
  1. two halftone plates made from a monochrome original but etched differently to create two values of intensity when superimposed in printing.
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Origin of duotype

First recorded in 1910–15; duo- + -type
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018