noun Pharmacology.
a white crystalline compound, C 7 H 1 0 N 2 OS, that interferes with the synthesis of thyroid hormone by the thyroid gland: used in the treatment of hyperthyroidism.

propyl + thiouracil Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
propylthiouracil (ˌprəʊpɪlˌθaɪəʊˈjʊərəsɪl)
a white crystalline water-insoluble substance with an intensely bitter taste, used in medicine to treat hyperthyroidism. Formula: C7H2N2OS
[from propyl + thio- + uracil (uro-1 + ac(etic) + -il-ile)]

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American Heritage
Medical Dictionary

propylthiouracil pro·pyl·thi·o·u·ra·cil (prō'pəl-thī'ō-yur'ə-sĭl')

Abbr. PTU An agent that inhibits the synthesis of thyroid hormones and is used in the treatment of hyperthyroidism.

The American Heritage® Stedman's Medical Dictionary
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