RUSTPROOF

rustproof, rustproofed

(adjective) treated against rusting

Source: WordNet® 3.1

Etymology

Adjective

rustproof (comparative more rustproof, superlative most rustproof)

Resistant to rust, oxidation and corrosion.

Synonyms: nonrusting, stainless

Verb

rustproof (third-person singular simple present rustproofs, present participle rustproofing, simple past and past participle rustproofed)

To make resistant to rust, such as by applying a coating.

We'll rustproof the metal with a good coat of paint and then we'll be able to leave it outdoors for years without damage.

Source: Wiktionary