- (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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for key plate
This done, we next take the frame and remove the key-plate from it.
By giving the key a quarter-turn the slit in the key-plate compresses the springs, and they are then withdrawn from the lock.On the Development and Distribution of Primitive Locks and Keys