Pronunciation: (mu-thī'us),[key] —n. 1. a disciple chosen to take the place of Judas Iscariot as one of the apostles. Acts 1:23–26.
2. 1557–1619, king of Hungary 1608–18; king of Bohemia 1611–17; emperor of the Holy Roman Empire 1612–19 (son of Maximilian II).
3. Also,Mat•thy'as.a male given name, form of Matthew.