Origin of lily iron
Examples from the Web for lily iron
Upon the end of the “shank” fits the head of the harpoon, known by the names swordfish-iron, lily-iron, and Indian dart.
Triced up to the jib stay was the long harpoon with its head, known as the 'lily-iron.'The Boy With the U. S. Fisheries|Francis Rolt-Wheeler
The lily-iron is, in principle, exactly what a whaleman would describe by the word “toggle.”