A reddish-brown flaky coating that forms on iron or its alloys when exposed to air and moisture.
e.g. The old car had rust spots all over the hood and trunk.
(noun)
be affected with rust or the reddish- or yellowish-brown flaky coating formed on iron especially when chemically attacked by moist air and composed essentially of hydrated ferric oxide;
e.g. Keep the razor in a dry area so the blades do not rust.
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