14 letters · 32 points in Scrabble
noun a drug (trade name Thorazine) derived from phenothiazine that has antipsychotic effects and is used as a sedative and tranquilizer
originBorrowed from French chloropromazine. By surface analysis, chlor- + promazine. First attested in the 1950s.
Etymology from Wiktionary, CC BY-SA 3.0