Definition of aerugo
: the rust of a metal and especially brass or copper : verdigris
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Origin and Etymology of aerugo
Middle English erugo “mildew, plant rust,” borrowed from Medieval Latin, going back to Latin aerūgō “verdigris,” from aer-, aes “bronze, brass, copper” + -ūgō, suffix marking a surface layer or discoloration — more at 1ore
First Known Use: 1664
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