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English word rust comes from Proto-Indo-European *h₁rewdʰ-, and later Proto-Germanic *rustaz (Rust.)
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*h₁rewdʰ- (Proto-Indo-European)
*rudʰso- (Proto-Indo-European)
*rudʰ-s-tos- (Proto-Indo-European)
*rustaz (Proto-Germanic)
Rust.
rūst (Old English)
rost (Middle English)
rust (English)
A disease of plants caused by a reddish-brown fungus.. A reddish-brown color.. A similar substance based on another metal (usually with qualification, such as "copper rust").. The deteriorated state of iron or steel as a result of moisture and oxidation. (figuratively) To degenerate in idleness; to become dull or impaired by inaction.. (intransitive) To be affected with the parasitic fungus [...]