IPA: //θaɪˈʊərəsɪl//
KK: /θaɪˈʊərəˌsɪl/
A white crystalline substance that affects the production of thyroid hormones and is used to treat conditions like hyperthyroidism.
The doctor prescribed thiouracil to help manage her hyperthyroidism.
Thiouracil is formed from "thio-" (meaning sulfur) and "uracil" (a nitrogenous base found in RNA). The word refers to a compound that contains sulfur and is related to uracil, which is a component of RNA.
Think of 'thio-' meaning sulfur, and 'uracil' as a part of RNA — thiouracil is a compound that includes sulfur and is connected to RNA.