/ Dictionary / Index B broad-spectrum: Meaning and Definition of Find definitions for: broad-spec•trum Pronunciation: (brôd'spek'trum), [key] — adj. noting an antibiotic effective against a wide range of organisms. having a wide range of uses. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. broadside broadsword Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language