cathedra

Noun

ca=the=dra

WORDNET DICTIONARY

cathedra(n = noun.artifact) bishop's throne - a throne that is the official chair of a bishop;

is a part of cathedral

is a kind of throne

Derived form adjective cathedral₁

cathedra, n. [L., fr. Gr. seat. See Chair.].

The official chair or throne of a bishop, or of any person in high authority. [1913 Webster]

"The Vatican Council declares that the Pope, is infallible “when he speaks ex cathedra.”" [1913 Webster]

Ex cathedra [L., from the chair], in the exercise of one's office; with authority.