The Collaborative International Dictionary
Making-iron
Making-iron \Mak"ing-i`ron\, n. A tool somewhat like a chisel with a groove in it, used by calkers of ships to finish the seams after the oakum has been driven in.
Wiktionary
making-iron
n. (context nautical English) A tool somewhat like a chisel with a groove in it, used by caulkers of ships to finish the seams after the oakum has been driven in.