CATHEDRA

‖Cath″e‐dra (?), n. [[L., fr. Gr. � seat. See Chair.]] The official chair or throne of a bishop, or of any person in high authority. Ex cathedra [], in the exercise of one's office; with authority. The Vatican Council declares that the Pope, is infallible “when he speaks ex cathedra.” Addis & Arnold's Cath. Dict.