The thyroid gland is a vital gland in the human endocrine system that produces hormones for various bodily functions. It is also known as the thyroidea, or simply the thyroid. Other synonyms for the thyroid gland include the thyroidal gland, the endocrine thyroid gland, the butterfly-shaped gland, and the thyrotrophic gland. This gland is located at the base of the neck, and its function is to regulate metabolism and energy levels in the body. A few other colloquial terms that refer to the thyroid gland include the "master gland" and the "energy conductor." Understanding the various synonyms for the thyroid gland can help improve communication between healthcare providers and patients when discussing thyroid health.