An example of rust is what happens to the chain on a bike that's been left out in the rain all winter.
- the reddish-brown or reddish-yellow coating formed on iron or steel by oxidation, as during exposure to air and moisture: it consists mainly of ferric oxide, FeO, and ferric hydroxide, Fe(OH)
- any coating or film formed on any other metal by oxidation or corrosion
- any stain or formation resembling iron rust
- any habit, influence, growth, etc. injurious to usefulness, to the mind or character, etc.
- disuse of mental or moral powers; inactivity; idleness
- the color of iron rust; reddish brown or reddish yellow
- any of various plant diseases characterized by a spotted reddish or brownish discoloration of stems and leaves
- any of an order (Uredinales) of basidiomycetous fungi causing rustin full rust fungus
Origin of rustMiddle English from OE, akin to German rost from Indo-European base an unverified form reudh-, red
- to affect or be affected by a rust fungus
- to become or cause to be coated with rust, as iron
- to deteriorate or spoil, as through disuse: a mind that has rusted
- to become or make rust-colored
- a. Any of various powdery or scaly reddish-brown or reddish-yellow hydrated ferric oxides and hydroxides formed on iron and iron-containing materials by low-temperature oxidation in the presence of water.b. Any of various metallic coatings, especially oxides, formed by corrosion.c. A stain or coating resembling iron rust.
- Deterioration, as of ability, resulting from inactivity or neglect.
- Botany a. Rust fungus.b. A plant disease caused by a rust fungus, characterized by reddish or brownish spots on leaves, stems, and other parts.
- A strong brown.
verbrust·ed, rust·ing, rusts
- To become corroded.
- To deteriorate or degenerate through inactivity or neglect: My golf game has rusted from all those years of not playing.
- To become the color of rust.
- Botany To develop a disease caused by a rust fungus.
- To corrode or subject (a metal) to rust formation.
- To impair or spoil, as by misuse or inactivity.
- To color (something) a strong brown.
Origin of rustMiddle English from Old English rūst ; see reudh- in Indo-European roots.
(third-person singular simple present rusts, present participle rusting, simple past and past participle rusted)
- (intransitive) 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.
- (intransitive) To be affected with the parasitic fungus called rust.
- (figuratively) To degenerate in idleness; to become dull or impaired by inaction.
From Middle English rust, rost, roust, from Old English rust, rÅ«st (“rust"), from Proto-Germanic *rustaz (“rust"), from Proto-Indo-European *rudÊ°so- (“red"), from Proto-Indo-European *hâ‚rewdÊ°- (“red"). Cognate with Scots roust (“rust"), Saterland Frisian rust (“rust"), West Frisian roast (“rust"), Dutch roest (“rust"), German Rost (“rust"), Danish rust (“rust"), Swedish rost (“rust"), Norwegian rust, ryst (“rust"). Related to red.