pigskin

Webster's Dictionary (1913)

1. The skin of a pig, — used chiefly for making saddles; hence, a colloquial or slang term for a saddle.

2. A football; — so called because the covering is often made of pigskin. colloquial

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54 · with additions: 1913 supplement