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phenothiazine

[ fee-nuh-thahy-uh-zeen, -zin ]
/ ˌfi nəˈθaɪ əˌzin, -zɪn /
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noun
Chemistry. a grayish-green to greenish-yellow, crystalline, water-insoluble solid, C12H9NS, used chiefly as an insecticide and vermifuge, and in the synthesis of pharmaceuticals.
Pharmacology. any of a class of medications used principally to treat psychotic symptoms, as delusions or hallucinations, and excessive excitability.
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Origin of phenothiazine

First recorded in 1890–95; pheno- + thiazine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

British Dictionary definitions for phenothiazine

phenothiazine
/ (ˌfiːnəʊˈθaɪəziːn) /

noun
a colourless to light yellow insoluble crystalline compound used as an anthelmintic for livestock and in insecticides. Formula: C 12 H 9 NS
any of several drugs derived from phenothiazine and used as strong tranquillizers and in the treatment of schizophrenia
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for phenothiazine

phenothiazine
[ fē′nō-thīə-zēn′ ]

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: C12H9NS.
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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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