Definition of ethylidene in English:
ethylidene
(also aethyliden)
noun ɪˈθʌɪlɪdiːnɪˈθɪlɪdiːn
Chemistry The divalent hydrocarbon radical CHCH₃. Usually attributive or a formative element in chemical names.
Origin
Mid 19th century; earliest use found in Henry Watts (1815–1884), chemist. From (i) German Äthyliden.