/ Dictionary / Index T Tetracyn: Meaning and Definition of Find definitions for: Tet•ra•cyn Pronunciation: (te'tru-sin), [key] — Pharm., Trademark. Pharm.,Trademark. a brand name for a form of tetracycline. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tetracycline tetrad 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