a white, crystalline, bitter-tasting powder, CHNOS, used to reduce thyroid activity, and in treating angina pectoris
See thiouracil in American Heritage Dictionary 4
(thīˌō-yo͝orˈə-sĭlˌ)
noun
A white crystalline compound, C4H4N2OS, that interferes with the synthesis of thyroxine, used to reduce the action of the thyroid gland, especially in the treatment of hyperthyroidism.