a white crystalline water-insoluble substance with an intensely bitter taste, used in medicine to treat hyperthyroidism; 2-thio-4-oxypyrimidine. Formula: C4H4N2OS
Word origin
from thio- + uracil (uro-1 + ac(etic) + -il-ile)
thiouracil in American English
(ˌθaɪoʊˈjʊrəsɪl)
noun
a white, crystalline, bitter-tasting powder, C4H4N2OS, used to reduce thyroid activity, and in treating angina pectoris