thyroid vein - any of several small veins draining blood from the thyroid areainferior thyroid vein - any of several veins on each side that drain the thyroid gland and empty into the innominate vein middle thyroid vein - a vein on each side that drains the lateral part of the thyroid and empties into the internal jugular vein superior thyroid vein - a vein on each side that drains the upper part of the thyroid and empties into the internal jugular vein vein, vena, venous blood vessel - a blood vessel that carries blood from the capillaries toward the heart; all veins except the pulmonary carry unaerated blood |