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key plate

noun, Printing.
(in color printing) the plate providing the greatest definition of detail, usually the black plate, on which the other plates are registered.
Origin of key plate
First recorded in 1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for key plate
Historical Examples
  • There were more spots on the key plate of the washstand, and this also was forced off.

    The Crime of the Century

    Henry M. Hunt
  • It consists of an uncoloured figure on a circular ground of colour, and is printed by the key plate.

    Gambia Frederick John Melville

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