/ Dictionary / Index T thiopental sodium: Meaning and Definition of Find definitions for: thi'o•pen'tal so'dium Pronunciation: (thī'u-pen'tl, -tal, -tôl, [key] — Pharm. thī"-),Pharm. a barbiturate, CHNNaOS, used as an anesthetic in surgery and, in psychiatry, for narcoanalysis and to stimulate recall of past events. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thionyl chloride thiophene 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