Nantucket /nænˈtʌkɪt/noun 1phrases 1 noun1 •A resort island south of Cape Cod, Massachusetts, United States, formerly a major whaling port.But most of all, at the dawn of a new millennium, who is a Nantucketer and what constitutes Nantucket heritage have been transformed. — 2026 Phrases with Nantucket Nantucket sleigh rideAn instance of the dragging of a whaleboat across the surface of a body of water by a harpooned whale.