“信口雌黄”的意思是没有根据,随便乱说,但为何与雌黄联系在一起呢?雌黄是一种矿物,柠檬黄色,硬度很小,可以轻易研磨开。古时人们写字时用的是黄纸,如果把字写错了,用这种矿物涂一涂,就可以重写。成语“信口雌黄”源于《晋书·王衍传》。王衍是东晋有名的清谈家。他担任地方县令时很少 “Letter mouth female yellow ” means there is no basis, casually say, but why associated with female yellow? Estrogen is a mineral, lemon yellow, hardness is very small, you can easily grind open. People used to write yellow paper in ancient times, if the word is wrongly written, painted with this mineral, you can rewrite. Idioms “Letter mouth female yellow ” from “Jin Shu Wang Yan Biography.” Wang Yan is a famous talker in the Eastern Jin Dynasty. He is rarely a county magistrate