You can make 423 anagrams from letters in ex-cathedra (-aacdeehrtx).
First recorded in 1810-20, ex cathedra is from the Latin word ex cathedrā literally, from the chair
For your ex cathedra knowledge of serving wines, for example.
Uncle Sam examined it and pronounced, ex cathedra, that it must have been a real letter.
Whatever is may not be right—the maxim has too much of an ex cathedra sound—but whatever is is interesting.
They are not to be foisted on one's readers as anything "ex cathedra."
Why does he pronounce, ex cathedra and robed, that Cowper is no poet?
Their opinions are given with an ex cathedra air that seems to exclude any appeal against them.