noun
a green rust or patina formed on copper or brass
adjective
related to or resembling the green rust on copper or brass
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The statue was covered in aerugo, giving it a green patina.
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I scrubbed and scrubbed, but I couldn't get rid of the aerugo on the metal railing.
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That old car has so much aerugo, it looks like it's been sitting in a swamp.
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The relationship had grown stale, like aerugo slowly spreading over a forgotten treasure.