语源 yǔyuán

[source of words] 一种语言形式(如一个词或词素)的历史(常包括其史前史)。从该词或词素在语言中最早出现的。追溯其语音、书法和词义的发展。

英语中称为：Etyma

解释为:A simple form inferred as the common basis from which related words in several languages can be derived by linguistic processes.