✨📕 The NEWThe NEW Collegiate Dictionary, 12th Edition Over 5,000 words added — Buy Now! Collegiate DictionaryBuy Now!

oxophenarsine

noun

oxo·​phen·​ar·​sine ˌäk-sə-fen-ˈär-ˌsēn How to pronounce oxophenarsine (audio) -sən How to pronounce oxophenarsine (audio)
: an arsenical formerly used in the form of its hydrochloride C6H6AsNO2·HCl to treat syphilis

Browse Nearby Words

Cite this Entry

“Oxophenarsine.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/oxophenarsine. Accessed 1 Dec. 2025.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!