Also found in: Thesaurus, Medical, Idioms, Encyclopedia, Wikipedia.


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.
2. Deterioration, as of ability, resulting from inactivity or neglect.
3. 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.
4. A strong brown.
v. rust·ed, rust·ing, rusts
1. To become corroded.
2. To deteriorate or degenerate through inactivity or neglect: My golf game has rusted from all those years of not playing.
3. To become the color of rust.
4. Botany To develop a disease caused by a rust fungus.
1. To corrode or subject (a metal) to rust formation.
2. To impair or spoil, as by misuse or inactivity.
3. To color (something) a strong brown.

[Middle English, from Old English rūst; see reudh- in Indo-European roots.]

rust adj.
rust′a·ble adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.rusting - the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water
corroding, corrosion, erosion - erosion by chemical action
oxidation, oxidisation, oxidization - the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction
ferric oxide - a red oxide of iron
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
I remember a long gallery of rusting stands of arms, and how I hesitated between my crowbar and a hatchet or a sword.
Suspend the parts in the cleaning solution (or after rusting, in the boiling water) with wires to keep the parts off the bottom, which might contain crud from previous jobs (that really ought not to be there but sometimes is) and also might get the parts too hot from direct contact with the outside metal.
Get rid of the source of the rust or paint the bit of metal that is rusting. You need to wet the surface first to stop the acid soaking into the cement.
V-11211,V-11212, V-11218, V-11227, V-11262, V-11288, V-11296, V-11304, V-11308, V-11319, V-11338, V-11353, V-11365 and V-11396 are the most prominent lines because these lines showed the combination of all three slow rusting genes as well as high yield potential.
In order to combine genes for enhancing rust resistance and high yield potential in wheat, parent lines were selected for hybridization on the basis of slow rusting history and phenotypic characters for durable resistance.
Then I go to six hours of rusting until I get the color I desire (it only takes one or two more passes).
The ship's metal is quickly corroding, or rusting, in the salty seawater.
Conversely, race-nonspecific resistance is mainly polygenic, this type of resistance has often been described as slow rusting or partial resistance [17] and is known to be long-lasting and more durable [9].
But all those insults are either already rusting or soon will.
The company had previously used paper and banding to cover the steel and secure it to pallets, but the methods did not work to protect the steel from condensation and prevent rusting. "Before the Yellow Jacket 87-M, we would have to worry about rust in two to three weeks," says Jones.