■ noun
1》 a reddish- or yellowish-brown flaking coating of iron oxide that is formed on iron or steel by oxidation, especially in the presence of moisture.
2》 a fungal disease of plants which results in reddish or brownish patches.
3》 a reddish-brown colour.
■ verb be affected with ~.
Derivatives
~less adjective
Origin
OE rūst , of Gmc origin; related to red .