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key plate

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noun Printing.
  1. (in color printing) the plate providing the greatest definition of detail, usually the black plate, on which the other plates are registered.
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Origin of key plate

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for key plate

Historical Examples

  • This done, we next take the frame and remove the key-plate from it.

    Scientific American Supplement, No. 561, October 2, 1886

    Various

  • By giving the key a quarter-turn the slit in the key-plate compresses the springs, and they are then withdrawn from the lock.