Pronunciation Noun


  1. The deteriorated state of iron or steel as a result of moisture and oxidation.
    The rust on my bicycle chain made cycling to work very dangerous.
  2. A similar substance based on another metal (usually with qualification, such as "copper rust").
    aerugo. Green or blue-green copper rust; verdigris. (American Heritage Dictionary, 1973)
  3. A reddish-brown color.
  4. A disease of plants caused by a reddish-brown fungus.
  5. (philately) Damage caused to stamps and album pages by a fungal infection.
Translations Translations Translations Verb

rust (rusts, present participle rusting; past and past participle rusted)

  1. (intransitive) To oxidize, especially of iron or steel.
    The patio furniture had rusted in the wind-driven spray.
  2. (transitive) To cause to oxidize.
    The wind-driven spray had thoroughly rusted the patio furniture.
  3. (intransitive) To be affected with the parasitic fungus called rust.
  4. (ambitransitive, figuratively) To (cause to) degenerate in idleness; to make or become dull or impaired by inaction.
    • Must I rust in Egypt? never more / Appear in arms, and be the chief of Greece?
Synonyms Translations Translations
Proper noun
  1. Surname
  2. A multiparadigm programming language focused on safety, especially safe concurrency.

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