/ Dictionary / Index T tetracycline: Meaning and Definition of Find definitions for: tet•ra•cy•cline Pronunciation: (te"tru-sī'klēn, -klin), [key] — n. Pharm. an antibiotic, CHHO, derived from chlortetracycline, used in medicine to treat a broad variety of infections. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tetracycline (Thesaurus) tetracoccus Tetracyn Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language