A pregnant mare is a horse that is carrying a foal in her uterus. There are many synonyms for a pregnant mare, depending on the context in which the term is used. Some of the most common synonyms include "broodmare," "dam," "pregnant horse," and "in foal mare." These terms are commonly used by horse breeders and owners, as well as veterinarians and other professionals in the equine industry. In addition to these synonyms, there are also many slang terms for a pregnant mare, such as "bun in the oven," "in the family way," and "pg." Whatever the terminology used, a pregnant mare is a precious and valuable animal, as she is responsible for bringing new life into the world.