parathyroid glandn. Any of usually four small kidney-shaped glands that lie in pairs near or within the posterior surface of the thyroid gland and secrete a hormone necessary for the metabolism of calcium and phosphorus.
parathyroid gland (pār'ə-thī'roid) Pronunciation Key
Any of four kidney-shaped glands located behind or within the thyroid gland of many vertebrate animals. ◇ The parathyroid glands secrete parathyroid hormone,which regulates the amount of calcium in the blood.