tetrachlorophenol

noun1

1. •
   Any of three isomeric tetrachloro derivatives of phenol

   • 2,4,5-trichlorophenol was partially dechlorinated to 3,4-dichlorophenol, pentachlorophenol was partially dechlorinated to 3,4-dichlorophenol and an unidentified tetrachlorophenol. — 2015