Thyronine is a hormone produced by the thyroid gland. However, there are synonyms for thyronine that can be used interchangeably. These include triiodothyronine (T3) and liothyronine. Both are also hormones produced by the thyroid gland that regulate metabolism and energy production in the body. These hormones are derived from the amino acid tyrosine and contain three iodine atoms. Other synonyms for thyronine include thyroxine (T4), which is also produced by the thyroid gland and plays a role in regulating metabolism. Understanding these synonyms is crucial for diagnosing and treating thyroid-related disorders.