Wiktionary
keyplate
n. 1 (context printing English) The plate that prints the detail in an image. 2 A plate mounted to a door and containing the keyhole.
Usage examples of "keyplate".
A silver keyplate, untarnished by the sea, seemed to beckon his tools.
A glowing, transparent keyplate comes into existence inches above the brass.
Then he was eagerly beaconing to Crup to bring the keyplates to open the entry lock.