pentachlorocyclohexane

/P EH1 N T AE1 K L AO1 R AH0 S AY1 K L OW1 HH IH0 K S EY1 N/
noun
  1. 1

    (organic chemistry) Any pentachloro derivative of cyclohexane, but especially 1,1,2,2,3-pentachlorocyclohexane