单词 ethylidene 释义 ethylidene Chem.|ldin|Also 9 -den.[f. ethyl + -ide + -ene.]The bivalent hydrocarbon radical CH3CH{b2}.1859H. Watts tr. Gmelin's Hand-bk. Chem. XIII. 451 Bromide of ethylidene. C4H4Br2.Ibid. 453 The term ethylidene is applied to a rad...