The thick, tough hide or leather made from a bull's skin, often used for durable goods.
Compound of 'bull' and 'skin.' Historically used to describe both the raw hide and the finished leather product. This straightforward descriptive term appears in trading records and crafts documentation from medieval times onward.
Bull leather was prized by toolmakers and saddlemakers because it's thicker than cow leather—a bull's skin literally has more collagen. Medieval craftsmen graded their materials carefully, and 'bullskin' was premium stuff.
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