IPA: /ˈkɒpəpleɪt/
KK: /ˈkɑpərˌpleɪt/
A type of printing plate made of copper that is engraved or etched to create designs or text for printing.
The artist used a copperplate to create beautiful prints of her artwork.
Copperplate is formed from "copper" (from Old English "coper", meaning a reddish-brown metal) and "plate" (from Old French "plate", meaning a flat dish or sheet). The term refers to a flat sheet made of copper, often used in printing or engraving.
Think of 'copper' as the reddish-brown metal used to make a flat 'plate' — that's why copperplate refers to a flat sheet of copper.