of or relating to the aristocratic Borromeo family of Northern Italy. / (Roman Catholicism) of or relating to Saint Charles Borromeo or any religious orders or institutions that trace their origin to him

A group of three small islands and two islets in the Italian part of Lago Maggiore, chiefly consisting out of Isola Bella, Isola Madre and Isola dei Pescatori.

Three rings joined together so that no pairs are individually linked

plural of Borromean nucleus

(physics) An atomic nucleus comprising three bound components in which any subsystem of two components is unbound.