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| rust [ rust ] |
noun (plural rusts) |
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| Definition: |
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1. reddish brown coating on metal: a reddish brown coating of iron oxide on the surface of iron or steel that forms when the metal is exposed to air and moisture
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2. something resembling rust: something that resembles rust, especially in color, e.g. another type of corrosion or a stain
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3. colors reddish brown: a reddish brown color
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4. botany plant disease: a plant disease caused by fungus in which reddish brown spots form on the leaves and stems
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5. fungi
Same as rust fungus
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verb (past and past participle rust·ed, present participle rust·ing, 3rd person present singular rusts) |
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| Definition: |
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1. transitive and intransitive verb corrode with rust: to cause something to corrode with rust, or become corroded with rust
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2. intransitive verb deteriorate: to deteriorate from neglect or lack of use
  His knowledge of German had rusted over the years.
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| [ Old English rūst< Germanic, "red"] |
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| rust adjective |
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