Home › Words › L › leukoencephalitisleukoencephalitisleukoencephalitis means an epizootic disease of horses, characterized by drowsiness, imperfect vision, partial paralysis of the throat, twitching of the muscles of the shoulder, unsteady gait, and softening of the white substance of the frontal lobes; forage poisoning.EtymologyFrom leuko- + encephalitis.nounAn epizootic disease of horses, characterized by drowsiness, imperfect vision, partial paralysis of the throat, twitching of the muscles of the shoulder, unsteady gait, and softening of the white substance of the frontal lobes; forage poisoning.Definitions & examples from Wiktionary (CC BY-SA 3.0).