/ Dictionary / Index S self-hardening: Meaning and Definition of Find definitions for: self-hard•en•ing Pronunciation: (self"här'dn-ing, self'-), [key] — adj. noting or pertaining to any of various steels that harden after heating without quenching or other treatment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. self-gratification selfheal Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language