Definition of "pigskin"

In addition, most gelatins made today are produced from pigskins, which are not subject to this consideration.

2009, Zushe Yosef Blech, Kosher Food Production, page 318

Those killed fighting his troops would be buried in pigskins.

2016, Robert Maddock, The 1,300 Years’ War: Volume One

“We gotta find those pigskins!” Squat insisted. “Pigskins?” Diddly asked. With obvious disdain, Squat replied, “Yeah, you know, that is what they call footballs, dummy.”

2011, J. H. Holland, Dsi: Diddly Squat Investigation, page 35