Piebald is another word for horse with large patches of white fur mixed with black fur. While small spots are referred to as Appaloosa markings, when the spots are large the horse is a pinto. The term piebald is more often used in Europe and the United Kingdom than in the United States. I remember reading one of the most popular horse books, National Velvet, as a horse loving kid. It was there I learned about the piebald markings on the mount ridden by the book's heroine. The horse was referred to often as simply "the piebald" which sent me to the dictionary, even then, to learn more about this unique horse color term.