"But when he had bought a watch with precious stones set in the case so large that they hurt his ribs, and a California saddle with silver nails and Angora skin suaderos, and ordered everybody up to the bar for whisky--what else was there for him to spend money for?"

Suadero is the tender meet from the lower part of a beef rib. ...

Another example of how the dictionary definition doesn't fit the context. It sounds as though it means something soft to make the saddle more comfortable.