phenothiazine noun. [fi:nǝʊ'Ɵʌɪǝzi:n, fɛn-] L19.
[from PHENO- + THIAZINE.]
1. A heterocyclic compound, C₁₂H₉NS, which is used to treat parasitic infestations of animals. L19.

2. Any of various derivatives of this, which constitute an important class of tranquillizing drugs used esp. in the treatment of mental illnesses. M20.

[TahlilGaran] English Dictionary ▲