单词	acetonylidene
释义	acetonylidene noun ac·​e·​ton·​yl·​i·​dene ˌa-sə-tō-ˈni-lə-ˌdēn, ə-ˌse-tə- plural -s : the bivalent radical CH3COCH< formed by removal of two hydrogen atoms from the same carbon atom of acetone Word History Etymology acetonyl + -idene First Known Use 1919, in the meaning defined above
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