Parathormone is a hormone secreted by the parathyroid glands that plays a crucial role in regulating calcium and phosphorus levels in the body. It is also known by various synonyms, such as parathyrin, PTH, parathormonal, and parathyrocalcitonin. Some of the other terms used to refer to this hormone include osteoclastic-activating factor, hypercalcemic factor, and parathyroid hormone-related protein. These synonyms often appear in scientific literature, medical textbooks, and research articles, and their use demonstrates the variety of contexts in which parathormone plays a critical role in maintaining the body's homeostatic balance. Despite the different names, the importance of this hormone remains unchanged, making it a vital component of human health.