al·kene
noun/ˈælkiːn/
/ˈælkiːn/
(chemistry)- any of a series of gases that contain hydrogen and carbon and that have a double bond (= force of attraction) between two of the atoms of carbon
烯；烯烃 Word Originlate 19th cent.: from alkyl (German, from Alkohol ‘alcohol’ + -yl) + -ene.