phenothiazine: Meaning and Definition of

phe•no•thi•a•zine

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