ethynyl
/ɪˈθʌɪnɪl/ /ɪˈθʌɪnʌɪl/ /ˈɛθɪnɪl/(also ethinyl) Chemistry
noun
The unsaturated hydrocarbon radical —C≡CH, derived from ethyne (acetylene). Usually attributive.
Origin
Mid 19th century; earliest use found in Proceedings of the Royal Society of London. From ethyne + -yl, after French éthinyle or its etymon German Aethinyl.