Plural form; multiple venomous snakes with copper-colored heads, or multiple Civil War-era Northern sympathizers with the Confederacy.
Simple English pluralization of copperhead by adding -s, applying equally to both the zoological and political meanings of the term.
Colonial-era naturalists were fascinated and terrified by copperheads because they were so common yet so deadly—entire family histories were shaped by encounters with these snakes in frontier homesteads.
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