"A mixture of concentrated nitric and hydrochloric acids. It is a highly corrosive liquid able to attack gold and other resistant substances", Early 17th century: Latin, literally 'royal water'.
"Of or denoting the secretory cells which produce hydrochloric acid in the main part of the stomach, or the glands which they compose", Late 19th century: from Greek oxunteos (verbal noun from oxunein 'sharpen') + -ic.
