bay scallop bays·cal·lop uncommon noun 1. muscle of small choice shallow-water scallops Synonymsbay scallop 2. a small scallop inhabiting shallow waters and mud flats of the Atlantic coast of North America Synonymsbay scallopPecten irradians Related words Broader terms scallop Parts bay scallopgenus Pecten Part of bay scallop WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.