\▐rәst\ n [ME, fr. OE rūst; akin to OE rēad red] (before 12c) The reddish, brittle coating formed on iron or its alloys resulting from exposure to humid atmosphere or chemical attach. NOTE − Not to be confused with white rust (Baboian R (2002) Corrosion engineer’s handbook, 3rd edn. NACE International – The Corrosion Society, Houston, TX; Uhlig HH (1948, 1971, 2000) Corrosion and corrosion control. Wiley, New York).