noun Pharmacology.

  1. a white, slightly water-soluble, bitter, crystalline powder C4H4N2OS, used chiefly in treating hyperthyroidism by reducing the activity of the thyroid gland.


  1. a white crystalline water-insoluble substance with an intensely bitter taste, used in medicine to treat hyperthyroidism; 2-thio-4-oxypyrimidine. Formula: C 4 H 4 N 2 OS


  1. A white crystalline compound that interferes with the synthesis of thyroxine, used to reduce thyroid gland activity, especially in the treatment of hyperthyroidism.
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