The meaning of RUST is the reddish brittle coating formed on iron especially when chemically attacked by moist air and composed essentially of hydrated ferric oxide.

RUST definition: 1. a reddish-brown substance that forms on the surface of iron and steel as a result of reacting…. Learn more.

RUST definition: the red or orange coating that forms on the surface of iron when exposed to air and moisture, consisting chiefly of ferric hydroxide and ferric oxide formed by oxidation. See examples of …

When a metal object rusts, it becomes covered in rust and often loses its strength. Copper nails are better than iron nails because the iron rusts. [VERB] There was an old rusting bolt on the door. …

RUST meaning: 1 : a reddish substance that forms on iron or some other metal usually when it comes in contact with moisture or air; 2 : a disease that causes plants to develop reddish-brown spots

There are 16 meanings listed in OED's entry for the word rust, three of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Rust appears as brown spots where the combination of water and oxygen has coated the metal with a compound that chemists call an oxide. Rust, which is also a verb, comes from a Germanic root …

Rust definition: Deterioration, as of ability, resulting from inactivity or neglect.

rust (rust), n. Metallurgy Also called iron rust. the red or orange coating that forms on the surface of iron when exposed to air and moisture, consisting chiefly of ferric hydroxide and ferric oxide formed by …

Definition of rust noun from the Oxford Advanced Learner's Dictionary. a red-brown substance that is formed on some metals by the action of water and air. The lock was covered with rust. The old …