phenothiazine

[ fee-nuh-thahy-uh-zeen, -zin ]

noun

1. Chemistry. a grayish-green to greenish-yellow, crystalline, water-insoluble solid, C 1 2 H 9 NS, used chiefly as an insecticide and vermifuge, and in the synthesis of pharmaceuticals.
2. Pharmacology. any of a class of medications used principally to treat psychotic symptoms, as delusions or hallucinations, and excessive excitability.

phenothiazine

/ ˌfiːnəʊˈθaɪəziːn /

noun

1. a colourless to light yellow insoluble crystalline compound used as an anthelmintic for livestock and in insecticides. Formula: C 12 H 9 NS
2. any of several drugs derived from phenothiazine and used as strong tranquillizers and in the treatment of schizophrenia

phenothiazine

/ fē′nō-thī′ə-zēn′ /

1. A yellow or green, toxic organic compound used in insecticides and dyes and to treat infections with worms and other parasites in livestock. Chemical formula: C 12 H 9 NS.
2. Any of a group of drugs derived from this compound. Phenothiazines are dopamine antagonists and are used in the treatment of psychiatric disorders, such as schizophrenia.

Word History and Origins

Origin of phenothiazine¹

First recorded in 1890–95; pheno- + thiazine