halothane /ˈhæl.ə.θeɪn/ noun1 •The halogenated hydrocarbon 2-bromo-2-chloro-1,1,1-trifluoroethane that is used as an inhalational general anaesthetic.Hepatic injury due to halothane is well described and can be an indirect cause of encephalopathy. — 1998 formshalothanes