/ Dictionary / Index B basic slag: Meaning and Definition of Find definitions for: ba'sic slag' Pronunciation: [key] — Metall. Metall. slag formed by the basic process of steelmaking, used as a furnace or converter lining or as a fertilizer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. basic salt basic statement Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language