What is "thiouracil"

n. (context organic compound English) Any of a class of heterocycles based on ''2-thioxo-1H-pyrimidin-4-one''; the parent compound interferes with the synthesis of thyroxine and is used in the treatment of hyperthyroidism

n. depresses the function of the thyroid gland

Thiouracil refers both to a specific molecule consisting of a sulfated uracil, and a family of molecules based upon that structure.