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Rust (Noun)

The formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water.

Nouns denoting natural processes.

A plant disease that produces a reddish-brown discoloration of leaves and stems; caused by various rust fungi.

Nouns denoting natural processes.

A red or brown oxide coating on iron or steel caused by the action of oxygen and moisture.

Nouns denoting substances.

The car's fender began to show rust after years of exposure to the elements.
As she held the old tool, she noticed the heavy rust interfering with its moving parts.
Rust covering the underside of the bridge had raised concerns about the structure's integrity.
The old ship had rust eating away its hull after decades in the salty sea water.
The high humidity in the storage room accelerated the formation of rust on the metal shelves.