thiouracil

/TH AY0 OW0 ER0 AE1 S AH0 L/
noun
  1. 1

    (organic chemistry) 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