[proh-pil-thahy-oh-yoo r-uh-sil]
noun Pharmacology.
  1. a white crystalline compound, C7H10N2OS, that interferes with the synthesis of thyroid hormone by the thyroid gland: used in the treatment of hyperthyroidism.

Origin of propylthiouracil Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for propylthiouracil


  1. a white crystalline water-insoluble substance with an intensely bitter taste, used in medicine to treat hyperthyroidism. Formula: C 7 H 2 N 2 OS

Word Origin for propylthiouracil

from propyl + thio- + uracil (uro- 1 + ac (etic) + -il -ile)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

propylthiouracil in Medicine


  1. An agent that inhibits the synthesis of thyroid hormones and is used 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.