/ Dictionary / Index A antimony 124: Meaning and Definition of Find definitions for: antimony 124 Pronunciation: [key] — Chem. Chem. the radioactive isotope of antimony having a mass number of 124 and a half-life of 60 days, used chiefly as a tracer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. antimony antimony hydride Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language