copperplate engraving is a noun meaning "an engraving consisting of a smooth plate of copper that has been etched or engraved". It carries one recorded sense.
an engraving consisting of a smooth plate of copper that has been etched or engraved
Definitions, synonyms and semantic relations for copperplate engraving come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.