The deteriorated state of iron or steel as a result of moisture and oxidation.
The rust on my bicycle chain made cycling to work very dangerous.
A similar substance based on another metal (usually with qualification, such as "copper rust").
aerugo. Green or blue-green copper rust; verdigris. (American Heritage Dictionary, 1973)
A reddish-brown color.
A disease of plants caused by a reddish-brown fungus.
Damage caused to stamps and album pages by a fungal infection.
To oxidize, especially of iron or steel.
The patio furniture had rusted in the wind-driven spray.
To cause to oxidize.
The wind-driven spray had thoroughly rusted the patio furniture.
To be affected with the parasitic fungus called rust.
To (cause to) degenerate in idleness; to make or become dull or impaired by inaction.