Wer·nicke \ˈver-nə-kə\ Carl (1848–1905), German neurologist. Wernicke is important for his work in relating nerve diseases to specific areas of the brain. The last two decades of his life were spent as professor of neurology and psychiatry first at Breslau and then at Halle, Germany. Wernicke belonged to a 19th-century school of German neuropsychiatry that made no distinction between disorders of the mind and disorders of the brain. He is best known for his studies of aphasia.