'aerugo' originates from Latin, specifically the word 'aerugo,' where 'aer-' meant 'copper' and '-ugo' referred to 'rust or patina.'

'aerugo' changed from the Latin word 'aerugo' and eventually became the modern English word 'aerugo.'

Initially, it meant 'copper rust,' but over time it evolved into its current meaning of 'green or blue-green patina on copper or brass.'