adj. & n.
adj. of or relating to the Council of Trent, held at Trento in Italy 1545-63, esp. as the basis of Roman Catholic doctrine.
n. a Roman Catholic adhering to this traditional doctrine. Tridentine mass the eucharistic liturgy used by the Roman Catholic Church from 1570 to 1964.
[ med.L Tridentinus f. Tridentum Trent ]