丁二烯 dīng'èrxī butadiene Definitions Defs Origin Strokes Stroke Words Sentences Sents 丁 dīng butyl (chemistry) A prefix or group indicating a four-carbon chain, such as butyl.二 èr numeral two the number two; 2烯 xī noun alkene (bound form) alkene; olefin; a class of unsaturated hydrocarbons containing carbon-carbon double bonds
