noun
- A greenish or bluish patina that forms on copper or bronze when exposed to air and moisture; verdigris.
Usage: archaic or technical; Latin origin, used in chemistry and metallurgy
Examples
- The ancient bronze statue was covered with a thick layer of aerugo.
- Aerugo forms naturally on copper roofs over many years.
- The chemist identified the green coating as aerugo, a copper oxide compound.
- Restorers carefully removed the aerugo to reveal the original metal beneath.