An imidazole derivative that interferes with the synthesis of thyroid hormone and is given orally in the treatment of hyperthyroidism; 1-methylimidazole-2-thiol, C ₃ H ₂ N ₂ (CH ₃)(SH). [International Nonproprietary Name (1996): thiamazole.].
1950s; earliest use found in American Journal of the Medical Sciences. From meth- (in methyl see note s.v. meth-) + im- and -azole.