CORNARIUS, or HAGENBUT, JOANNES, a celebrated physician, born at Zwickau, Saxony, in 1500. He was professor of medicine at Marburg, and subsequently at Jena, where he died in 1558. He spent the greater part of his life in translating the works of the Greek physicians, whose systems he wished to inculcate in preference to those of the Arabians. With this view he translated the works of Hippocrates, Aetius, Paulus Aegineta, Dioscorides, and several of those of Galen. He translated also some of the works of the Greek fathers, and wrote Universæ rei medicæ epigraphe. Cornarius was at one time engaged in a violent controversy with Fuchs the distinguished botanist.