Lerwick Syllabification: (Ler·wick)Pronunciation: /ˈlərwik/Definition of Lerwick the capital of the Shetland Islands, on the island of Mainland; population 6,200 (2009). The most northerly town in the British Isles, it is a fishing center and a service port for the oil industry. Lerwick in other Oxford dictionaries Definition of Lerwick in the British & World English dictionary