theatineEtymologyNamed after Chieti (Theate), of which one of its founders, John Peter Caraffa, was bishop.theatine means Of or belonging to the Theatines Lexicurio rates it Sui generis — a strength score of 87 out of 100.adjOf or belonging to the TheatinesnounA member of a Catholic order established in 1524 in Italy, which consisted of monks and later, nuns under the direction of the monks.