Grand Canal grand·ca·nal uncommon noun 1. the major waterway in Venice, Italy SynonymsGrand Canal 2. an inland waterway 1000 miles long in eastern China; extends from Tianjin in the north to Hangzhou in the south SynonymsGrand Canal Related words Broader terms canal Parts ChinaVenice WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.