%callot%

{ ‖, n. [ F. calotte, dim. of cale a sort of flat cap. Cf. Caul. ] A close cap without visor or brim. Especially: (a) Such a cap, worn by English serjeants at law. (b) Such a cap, worn by the French cavalry under their helmets. (c) Such a cap, worn by the clergy of the Roman Catholic Church. [ 1913 Webster ]

To assume the calotte, to become a priest. [ 1913 Webster ]