propylidene
/prəʊˈpʌɪlɪdiːn/ /prəʊˈpɪlɪdiːn/Chemistry
noun
The divalent hydrocarbon radical CH·CH2CH3. Usually attributive or a formative element in chemical names.
Origin
Late 19th century; earliest use found in Journal of the Chemical Society. From propyl + -idene, after French propylidène.