phenothiazine

 
Pronunciation: /ˌfiːnəʊˈθʌɪəziːn, ˌfɛnəʊ-/

noun

[mass noun] Chemistry
  • a synthetic compound which is used in veterinary medicine to treat parasitic infestations of animals.
    • A heterocyclic compound; chemical formula: C12H9NS
  • [count noun] Psychiatry any of a group of derivatives of phenothiazine with tranquillizing properties, used in the treatment of mental illness.