Cor·pus Chris·ti1 /ˌkɔːpəs ˈkrɪsti $ ˌkɔːr-/ (also the Feast of Corpus Christi) a holy day in the Roman Catholic Church, when the sacrament (=the holy bread eaten at the Eucharist) is carried in procession. Corpus Christi is Latin for ‘the Body of Christ’.