stainless steel

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various steels alloyed with at least 10 percent chromium and sometimes containing other elements and that are resistant to corrosion or rusting associated with exposure to water and moist air.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An alloy of iron and chromium that resists corrosion.
• adjective Made of stainless steel.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun steel containing chromium that makes it resistant to corrosion