noun Pharmacology.
a white, slightly water-soluble, bitter, crystalline powder C 4 H 4 N 2 OS, used chiefly in treating hyperthyroidism by reducing the activity of the thyroid gland.

1940–45; thio- + uracil Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thiouracil (ˌθaɪəʊˈjʊərəsɪl)
a white crystalline water-insoluble substance with an intensely bitter taste, used in medicine to treat hyperthyroidism; 2-thio-4-oxypyrimidine. Formula: C4H4N2OS
[from thio- + uracil (uro-1 + ac(etic) + -il-ile)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

thiouracil thi·o·u·ra·cil (thī'ō-yur'ə-sĭl')
A white crystalline compound that interferes with the synthesis of thyroxine, used to reduce thyroid gland activity, especially in the treatment of hyperthyroidism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Thiouracil is a thiol-containing pyrimidine that is selectively incorporated into cells that synthesize melanin.
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