| • | 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. |
