stainless steeln. 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.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.stainless steel n (Metallurgy) a. a type of steel resistant to corrosion as a result of the presence of large amounts of chromium (12?15 per cent). The carbon content depends on the application, being 0.2?0.4 per cent for steel used in cutlery, etc, and about 1 per cent for use in scalpels and razor bladesb. (as modifier): stainless-steel cutlery. Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014stain?less steel? n. alloy steel containing 12 percent or more chromium, so as to be resistant to rust and attack from various chemicals. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.stain·less steel (st?n?l?s) Any of various steel alloys that are resistant to rusting and corrosion because they contain chromium and nickel.The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.