rusting, rust - the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water

rust - a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture

oxide - any compound of oxygen with another element or a radical

haemosiderin, hemosiderin - a granular brown substance composed of ferric oxide; left from the breakdown of hemoglobin; can be a sign of disturbed iron metabolism