Rust

Definition of Rust

(Chem.) 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.

(Bot.) 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.

Sacred truths cleared from all rust and dross of human mixtures.

- Eikon Basilike.

Rust joint
a joint made between surfaces of iron by filling the space between them with a wet mixture of cast-iron borings, sal ammoniac, and sulphur, which by oxidation becomes hard, and impervious to steam, water, etc.

Rust mite
(Zool.) a minute mite (Phytopius oleivorus) which, by puncturing the rind, causes the rust-colored patches on oranges.

v. i.

To contract rust; to be or become oxidized.

[imp. & p. p. Rusted; p. pr. & vb. n. Rusting.]

If gold ruste, what shall iron do?

- Chaucer.

Our armors now may rust.

- Dryden.

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.

Must I rust in Egypt? never more
Appear in arms, and be the chief of Greece?

- Dryden.

v. t.

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

Keep up your bright swords, for the dew will rust them.

- Shak.

To impair by time and inactivity.

Related Words

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