thyr/o or thyroid/o is a combining form that refers to “thyroid gland”.
The thyroid gland is an endocrine gland located in the neck. It secretes two hormones into the bloodstream: thyroxine (T4) and triiodothyronine (T3). These hormones are crucial for controlling the body’s metabolic rate, the function of the heart, muscles, and digestive system, as well as the development of the brain and maintaining bone health.
