名詞 etymon:

1. a simple form inferred as the common basis from which related words in several languages can be derived by linguistic processes
   同義詞：root

et.y.mon

n.（名詞）
【復(fù)數(shù)】 et.y.mons 或 et.y.ma [-m…]
An earlier form of a word in the same language or in an ancestor language. For example, Indo-European.duwo and Old English tw3 are etymons of Modern English two.
詞的原形：在同一語言中和在祖系語言中一個(gè)詞的原始形式。例如，印歐語中的duwo 和古英語中的 twa 都是現(xiàn)代英語中 two 的原形詞
A word or morpheme from which compounds and derivatives are formed.
用于形成復(fù)合詞或引申字的詞或復(fù)合語
A foreign word from which a particular loanword is derived. For example, Latinduo, .two,. is an etymon of English duodecimal.
外來語的詞源：某一外來語來源于某一外國(guó)語中的單詞。例如，拉丁語中的duo 即是英語中 dueodecimal 這個(gè)外來語的詞源

來源：
Latin
拉丁語
from Greek etumon [true sense of a word]
源自 希臘語 etumon [詞的含義]
from etumos [true]
源自 etumos [真正的]