What does coppered mean?
"Coppered" is the past tense and past participle of the verb "copper," meaning to coat or sheathe something with copper. Its best-known use is maritime: from the mid-to-late eighteenth century, wooden warships had their hulls below the waterline coppered with thin metal sheets to protect against shipworm, a mollusc that bored into timber, and to reduce fouling by marine growth, which slowed ships considerably. A coppered hull therefore signified both durability and speed, and the practice spread rapidly through the world's navies and merchant fleets. Beyond shipbuilding, the word appears in metallurgy and electroplating, where an object may be coppered before receiving another finish such as gilding. Though uncommon in everyday speech today, "coppered" survives in naval history writing and technical descriptions, carrying connotations of craftsmanship, protection, and the age of sail.
verb (past tense and past participle of 'copper')Coated or sheathed with copper, especially the underwater hull of a ship to protect it from shipworm and fouling. More generally, covered or plated with a thin layer of copper.
- (of a ship's hull) sheathed with copper plates below the waterline as protection against shipworm and marine growth
- coated, plated, or electroplated with a layer of copper
"By the late eighteenth century, most Royal Navy vessels were coppered to guard against shipworm."
"The frigate was coppered during her 1780 refit, and her speed improved markedly."
"The jeweler coppered the silver pendant before applying the final gilt finish."
Coppering a warship's hull was so effective against shipworm and barnacles that it could add knots of speed — a literal metal skin that made navies faster.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of coppered
The word derives from "copper," which entered English via Old English "copor," borrowed from Late Latin "cuprum," a contraction of "aes Cyprium" meaning "metal of Cyprus," where the Romans mined much of their copper. The verb "copper," meaning to coat with copper, developed from the noun, and its widespread adoption followed the Royal Navy's adoption of copper sheathing for hulls in the later eighteenth century. Related English words sharing the Latin root include "cuprous" and "cupric," used in chemistry to denote copper compounds.
Related word forms
How coppered is actually used
Most common in historical and maritime contexts describing wooden sailing ships; in modern technical use it appears in electroplating and metallurgy. The verb 'copper' itself is relatively rare outside these registers.
Easily confused with coppered
'Covered' means concealed or overlaid generally, while 'coppered' specifically means coated with the metal copper.