Thionamides

Part of speech: noun

Definitions

1. Sulfur-containing chemical compounds that block the production of thyroid hormones and are used to treat an overactive thyroid
2. Organic compounds featuring a thioamide group, prescribed as antithyroid medicines to suppress excess thyroid activity
3. Drug molecules built around a sulfur and nitrogen amide structure that interfere with thyroid hormone synthesis in the body

Etymology: "Thionamides" is simply the plural of "thionamide," so the word's history lies in its singular form. A thionamide is a chemical compound in which a sulfur atom has been placed in a position where an oxygen atom would normally sit in an amide, the class of compounds built around a carbon atom bonded to a nitrogen. The name comes from the Greek "theion," meaning sulfur, combined with "amide," the chemists' term for these nitrogen-containing compounds. The prefix "thio-" is the standard chemical marker for replacing oxygen with sulfur, so the name tells a chemist exactly what the molecule has been changed to. The plural follows the ordinary English pattern for count nouns, adding "-s" to give "thionamides" when referring to more than one such compound. Because the word is a systematic chemical coinage built from classical roots, it was not used by ancient Greek writers, who had the word for sulfur but no concept of thionamides.