deep-dish Syllabification: (deep-dish)Definition of deep-dish adjective 1(of a pie) baked in a deep dish to allow for a large filling:deep-dish apple pie (of a pizza) baked in a deep dish and having a thick dough base. 2 informal extreme or thoroughgoing:a deep-dish Catholicdeep-dish in other Oxford dictionaries Definition of deep-dish in the British & World English dictionary