an iron pin used at sea to splice or fasten ropes together; it is made tapering and sharp at one end. There are also fids of wood, which are much larger than the iron ones.

The pin also in the heel of the topmast, which bears it upon the chief-tree, is called a fidd.

FIDD-Hammer, is used for a hammer, the handle of which is a fidd, or made tapering into that form.