rust meaning and definition

RUST noun

Definition of rust (noun)

1. a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture
2. a plant disease that produces a reddish-brown discoloration of leaves and stems; caused by various rust fungi
3. the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water
   • synonyms: rusting
4. any of various fungi causing rust disease in plants
   • synonyms: rust fungus

RUST verb

Definition of rust (verb)

1. become destroyed by water, air, or a corrosive such as an acid
   • "The metal corroded"; "The pipes rusted"
   • synonyms: corrode
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"
   • synonyms: corrode, eat
3. become coated with oxide

RUST adjective

Definition of rust (adjective)

1. of the brown color of rust
   • synonyms: rust-brown, rusty