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thiopental Syllabification: thi·o·pen·tal
Pronunciation: /ˌTHī-ōˈpenˌtal/ /-tôl/

Definition of thiopental in English:


Medicine North American
A sulfur-containing barbiturate drug used as a general anesthetic and hypnotic, and (reputedly) as a truth serum.
Example sentences
  • In the critical care setting, midazolam, thiopental, and several antibiotics can be added to this list.
  • He and others canvassed six American states for information about their execution protocols, all of which use sequential injections of thiopental, a muscle relaxant, and potassium chloride to kill condemned prisoners.
  • Fentanyl or thiopental may be given intravenously if a deeper level of anesthesia is required during some parts of the procedure.


1940s: from thio- + a contraction of pentobarbital.

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