What is "superior thyroid vein"

n. a vein on each side that drains the upper part of the thyroid and empties into the internal jugular vein

The superior thyroid vein begins in the substance and on the surface of the thyroid gland, by tributaries corresponding with the branches of the superior thyroid artery, and ends in the upper part of the internal jugular vein.

It receives the superior laryngeal and cricothyroid veins.