phenothiazine

noun

phe·​no·​thi·​a·​zine ˌfē-nō-ˈthī-ə-ˌzēn 

1

: a greenish-yellow crystalline compound C₁₂H₉NS used as an anthelmintic and insecticide especially in veterinary practice

2

: any of various phenothiazine derivatives (such as chlorpromazine) that are used as tranquilizing agents especially in the treatment of schizophrenia

Examples of phenothiazine in a Sentence

Recent Examples on the Web

According to a coroner’s report obtained by TMZ, Peterson reportedly had a deadly cocktail of prescription drugs in her system at the time of her death, including benzodiazepines, opiates and phenothiazines (an anti-psychotic medication). — Gillian Telling, PEOPLE, 27 Dec. 2025

It's also not recommended for use with the phenothiazine class of antipsychotics, which are used in the treatment of schizophrenia. — Jes Skolnik, Allure, 23 Sep. 2021

Word History

Etymology

International Scientific Vocabulary

First Known Use

1894, in the meaning defined at sense 1

Rhymes for phenothiazine

• acetylene
• adamantine
• adenosine
• amphetamine
• anthropocene
• apoprotein
• aquamarine
• arsphenamine
• azobenzene
• buprenorphine
• catecholamine
• chlorobenzene

Medical Definition

phenothiazine

noun

phe·​no·​thi·​azine ˌfē-nō-ˈthī-ə-ˌzēn 

1

: a greenish yellow crystalline compound C₁₂H₉NS used as an anthelmintic and insecticide especially in veterinary practice

called also thiodiphenylamine

2

: any of various phenothiazine derivatives (as chlorpromazine) that are used as tranquilizing agents especially in the treatment of schizophrenia