Longman Dictionary of Contemporary English homepage

Language: Old English
Origin:

rust

1 noun
     
rust1 [uncountable]
1HCE the reddish-brown substance that forms on iron or steel when it gets wet [↪ rusty]:
There were large patches of rust on the car.
2HBP a plant disease that causes reddish-brown spots
Definition from the Longman Dictionary of Contemporary English
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