lead encephalopathy n.
A rapidly developing encephalopathy caused by the ingestion of lead compounds and seen particularly in early childhood, marked by convulsion, delirium, hallucination, and other cerebral symptoms related to chronic lead poisoning. Also called lead encephalitis.
This view would explain the absence of changes apparent to the eye found in so many of the fatal cases of lead encephalopathy.
But in 1830, Tanqueril first definitely described the production of a mental disease, which he called “lead encephalopathy.”