/ Dictionary / Index T Tuinal: Meaning and Definition of Find definitions for: Tu•i•nal Pronunciation: (t'i-nôl"), [key] — Pharm., Trademark. Pharm.,Trademark. a brand name for a combination of amobarbital and secobarbital used as a prompt and sustained sedative and hypnotic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tuille tuition Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language