Usually means: Corrosion of iron by oxidation.
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We found 47 dictionaries that define the word Rust:

General (28 matching dictionaries)
  1. rust: Longman Dictionary of Contemporary English
  2. rust: Merriam-Webster
  3. rust: Oxford Learner's Dictionaries
  4. rust: American Heritage Dictionary of the English Language
  5. rust: Collins English Dictionary
  6. rust: Vocabulary.com
  7. Rust, rust: Wordnik
  8. rust: Cambridge Advanced Learner's Dictionary
  9. Rust, rust: Wiktionary
  10. rust: Webster's New World College Dictionary, 4th Ed.
  11. rust: The Wordsmyth English Dictionary-Thesaurus
  12. rust: Infoplease Dictionary
  13. RUST: Dictionary.com
  14. rust (n.): Online Etymology Dictionary
  15. rust: Cambridge Essential American English Dictionary
  16. RUST (band), Rust (album), Rust (color), Rust (colour), Rust (comics), Rust (disambiguation), Rust (disease), Rust (fungus), Rust (programming), Rust (programming language), Rust (surname), Rust (video game), Rust: Wikipedia, the Free Encyclopedia
  17. Rust: Online Plain Text English Dictionary
  18. rust: Webster's Revised Unabridged, 1913 Edition
  19. rust: Rhymezone
  20. rust, rust(periode) (de), rust (de): AllWords.com Multi-Lingual Dictionary
  21. rust: Webster's 1828 Dictionary
  22. Rust: E Cobham Brewer, The Reader's Handbook
  23. rust: FreeDictionary.org
  24. rust: Mnemonic Dictionary
  25. rust: TheFreeDictionary.com
  26. rust: Wikimedia Commons US English Pronunciations

Art (3 matching dictionaries)
  1. rust: ArtLex Lexicon of Visual Art Terminology
  2. rust-: A Cross Reference of Latin and Greek Elements
  3. Glossary of Stamp Collecting Terms (No longer online)

Business (1 matching dictionary)
  1. Construction Term Glossary (No longer online)

Computing (1 matching dictionary)
  1. Rust (fungus), Rust (iron oxide), rust: Encyclopedia

Medicine (3 matching dictionaries)
  1. rust: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. Rust (iron oxide), rust: Medical dictionary

Miscellaneous (6 matching dictionaries)
  1. baby names list (No longer online)
  2. Brilliant Dream Dictionary (No longer online)
  3. Arms and Armour (No longer online)
  4. RUST: Acronym Finder
  5. AbbreviationZ (No longer online)
  6. rust: Idioms

Science (1 matching dictionary)
  1. Botanical Terms (No longer online)

Slang (2 matching dictionaries)
  1. rust: Green’s Dictionary of Slang
  2. Rust: Urban Dictionary

Tech (2 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. RUST: Power Engineering

(Note: See rusted as well.)

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Definitions from Wiktionary (Rust)

▸ noun:  The deteriorated state of iron or steel as a result of moisture and oxidation.
▸ noun:  A similar substance based on another metal.
▸ noun:  A reddish-brown color.
▸ noun:  A disease of plants caused by a reddish-brown fungus.
▸ noun:  (philately) Damage caused to stamps and album pages by a fungal infection.
▸ verb:  (intransitive) To oxidize, especially of iron or steel.
▸ verb:  (transitive) To cause to oxidize.
▸ verb:  (intransitive) To be affected with the parasitic fungus called rust.
▸ verb:  (ambitransitive, figuratively) To (cause to) degenerate in idleness; to make or become dull or impaired by inaction.
▸ verb:  (intransitive) Of a black cat or its fur, to turn rust-coloured following long periods of exposure to sunlight.
▸ noun:  A surname.
▸ noun:  (computer languages) A multiparadigm programming language focused on safety, especially safe concurrency.

Similar:
rusty, corrode, eat, colored, chromatic, rust fungus, iron mould, tarnish, red rot, aerugo, more...

Opposite:
polish

Types:
red rust, black rust, brown rust, more...

Phrases:
Stem rust, leaf rust, blister rust, Rust Belt, rust fungi, more...

Adjectives:
white, black, red, yellow, brown, iron, common, green, loose, orange, fusiform

Colors:
    rust,     burnt sienna,     copper,     chestnut,     mahogany, more...


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▸ Idioms related to Rust

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▸ Popular adjectives describing Rust

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▸ Rhymes of Rust

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Similar:
rusty, corrode, eat, colored, chromatic, rust fungus, iron mould, tarnish, red rot, aerugo, more...

Opposite:
polish

Types:
red rust, black rust, brown rust, more...

Phrases:
Stem rust, leaf rust, blister rust, Rust Belt, rust fungi, rust fungus, crown rust, wheat rust, iron rust, yellow rust, stripe rust, red rust, fusiform rust, rust red, white rust, rust mite, rust colored, apple rust, more...

Adjectives:
white, black, red, yellow, brown, iron, common, green, loose, orange, fusiform

Colors:
    rust,     burnt sienna,     copper,     chestnut,     mahogany, more...



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