ذَاتِ أَلْوَاحٍ وَدُسُرٍ‌ (to board that [ ship ] which had planks and nails...54:13). The word alwah is the plural of lawh and it refers to a board or a plank. The word dusur is the plural of disar and it stands for nail. It also means a cord of fibres of the palm tree with which the planks of a ship are bound together.