/ Dictionary / Index S slag cement: Meaning and Definition of Find definitions for: slag' cement" Pronunciation: [key] a cement composed of about 80 percent granulated slag and about 20 percent hydrated lime. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. slag slaggy Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language