Guernsey2 Syllabification: (Guern·sey)Pronunciation: /ˈgərnzē/Translate Guernsey | into French | into Italian | into Spanish Definition of Guernsey noun (plural Guernseys) 1an animal of a breed of dairy cattle from Guernsey, noted for producing rich, creamy milk. 2 (guernsey) a thick sweater made with oiled navy blue wool and originally worn by fishermen. Guernsey in other Oxford dictionaries Definition of Guernsey in the British & World English dictionary