"Royal stud" is a phrase used to describe a male animal of purebred stock, typically a horse or a dog, that has been carefully selected for its exceptional qualities and is used for breeding purposes. There are various synonyms for this term, including "breeding stallion," "studbook sire," "champion sire," or "elite sire." These terms highlight the exclusive and coveted status of these animals as they are often sought after by breeders and owners alike. The term "royal stud" has a regal feel to it, implying a high degree of excellence and prestige, and is often used in the context of horse racing or dog shows.