The Collaborative International Dictionary
Douglas Harper's Etymology Dictionary
"iron rod used in manipulating hot glass," 1660s, from French pontil, a diminutive form from Latin punctum "a point" (see point (n.)).\n
Wiktionary
alt. (context glassblowing English) A metal rod used in the glassblowing process. After a glass vessel has been blown to approximate size and the bottom of the piece has been finalized, the rod, which is tipped with a wad of hot glass, is attached to the bottom of the vessel to hold it while the top is finalized. It often leaves an irregular or ring-shaped scar on the base when removed called the "pontil mark". n. (context glassblowing English) A metal rod used in the glassblowing process. After a glass vessel has been blown to approximate size and the bottom of the piece has been finalized, the rod, which is tipped with a wad of hot glass, is attached to the bottom of the vessel to hold it while the top is finalized. It often leaves an irregular or ring-shaped scar on the base when removed called the "pontil mark".
Usage examples of "punty".
In Rose's hands a punty iron tipped with semi liquid glass had been literally a lethal weapon, and it had seemed to me that as it was me she was after, however weird and mistaken her beliefs, it was I who ought to stop her.