rust

v. become corroded due to the oxidation of iron, become rusty

n. flaky orange coating which forms on metal due to the oxidation of iron; fungal disease of plants characterized by reddish or brown spots on the leaves and stem (Botany)

Rust is a general term for iron oxides formed by the reaction of iron with oxygen. Several forms of rust are distinguishable visually and by spectroscopy, and form under different circumstances. The chemical composition of rust is typically hydrated iron(III) oxide (Fe2O3.nH2O), and under wet conditions may include iron(III) oxide-hydroxide (FeO(OH)). Rusting is the common term for corrosion of iron and its alloys, such as steel. Although oxidation of other metals is equivalent, these oxides are not commonly called rust.
See more at Wikipedia.org...

Rust n. Any of a group of parasitic fungi of the order Uredinales that are plant pathogens, especially of cereal grains, and that can produce [more]Rust - Community and Resources

Noun
1. a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture
(hypernym) ferric oxide
(substance-meronym) goethite, gothite
2. a reddish-brown discoloration of leaves and stems caused by a rust fungus
(hypernym) plant disease
(hyponym) blister rust, white-pine rust, white pine blister rust
3. the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water
(synonym) rusting
(hypernym) corrosion, corroding, erosion
(substance-meronym) ferric oxide
4. any of various fungi causing rust disease in plants
(synonym) rust fungus
(hypernym) fungus
(hyponym) flax rust, flax rust fungus, Melampsora lini
(member-holonym) Uredinales, order Uredinales
(part-meronym) aecium
Verb
1. become destroyed by water, air, or an etching chemical such as an acid; "The metal corroded"; "The pipes rusted"
(synonym) corrode
(hypernym) decay, crumble, delapidate
(hyponym) fret, eat away
(verb-group) corrode, eat
(derivation) rusting
2. cause to deteriorate due to the action of water, air, or an acid; "The acid corroded the metal"; "The steady dripping of water rusted the metal stopper in the sink"
(synonym) corrode, eat
(hypernym) damage
(verb-group) corrode
3. become coated with oxide
(hypernym) oxidise, oxidize, oxidate
(verb-group) oxidize, oxidise, oxidate
(derivation) rusting
Adjective
1. of the color of rust
(synonym) rusty
(similar) chromatic

v. prepare, make ready, get oneself ready; arm, equip with weapons, armor, cover with armor