Posted on August 8, 2015 by dimitriA Photo a day (334 of 365) caul·dron also cal·dron (kôl′drən)n.1. A large vessel, such as a kettle or vat, used for boiling.2. A state or situation of great distress or unrest felt to resemble a boiling kettle or vat: a cauldron of conflicting corporate politics.