/ Dictionary / Index C carrier-free: Meaning and Definition of Find definitions for: car•ri•er-free Pronunciation: (kar'ē-ur-frē"), [key] — adj. Chem. (of a radioactive isotope) capable of functioning as a tracer without the use of a carrier. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Carrière carrier pigeon Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language