Thyroidal refers to anything related to the thyroid gland. Some synonyms for this word could include thyroid, thyroidal, thyroidean, thyroideal, thyroidian, or thyronormal. These words can be used interchangeably to describe any function, system or disease related to the thyroid. The thyroid gland is a small, butterfly-shaped gland located in the neck that produces hormones that regulate metabolism. Thyroidal can be used to describe the symptoms of an overactive or underactive thyroid gland, such as fatigue, weight gain or weight loss, and mood swings. Understanding these synonyms can help medical professionals accurately diagnose and treat thyroid-related troubles.