What is "fullered"

Usage examples of "fullered".

Next comes the flatter, and the quick blows to smooth the fullered iron.

Then he sets the fullered bar in the forge to heat, while he takes the tongue and heats it almost to white-hot before removing it and using the hammer to scarf the contact points and upset the edges where he will wrap the bar stock.

When he is done, he sets the fullered and ordered iron on the back edge of the forge to anneal, and searches for another chunk of scrap.

Jayge replied, selecting the iron bar, already fullered and swaged, and crunching off the length he needed.