Rust

The reddish yellow coating formed on iron when exposed to moist air, consisting of ferric oxide or hydroxide; hence, by extension, any metallic film of corrosion.

A minute mold or fungus forming reddish or rusty spots on the leaves and stems of cereal and other grasses (Trichobasis Rubigo-vera), now usually believed to be a form or condition of the corn mildew (Puccinia graminis). As rust, it has solitary reddish spores; as corn mildew, the spores are double and blackish.

That which resembles rust in appearance or effects.

A composition used in making a rust joint. See Rust joint, below.

Foul matter arising from degeneration; as, rust on salted meat.

Corrosive or injurious accretion or influence.

To contract rust; to be or become oxidized.

To be affected with the parasitic fungus called rust; also, to acquire a rusty appearance, as plants.

To degenerate in idleness; to become dull or impaired by inaction.

To cause to contract rust; to corrode with rust; to affect with rust of any kind.

To impair by time and inactivity.

any of various fungi causing rust disease in plants

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

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