rust

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

of the brown color of rust

any of various fungi causing rust disease in plants

become destroyed by water, air, or a corrosive such as an acid

“The pipes rusted”

cause to deteriorate due to the action of water, air, or an acid

“The steady dripping of water rusted the metal stopper in the sink”

a plant disease that produces a reddish-brown discoloration of leaves and stems; caused by various rust fungi

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

become coated with oxide