/ Dictionary / Index M mild steel: Meaning and Definition of Find definitions for: mild' steel' Pronunciation: [key] low-carbon steel, containing no more than 0.25 percent carbon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mild silver protein mile Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language