n.[語]原始母語

Historical linguists have to identify and classify families of related languages in a genealogical family tree, and to reconstruct the protolanguage. 歷史語言學家們通過對各語系中相關語言進行甄別，勾畫出家族譜系圖，從而重新構建語系的原始語。

"Proto" is a combining form in a word like "protolanguage" that refers to the hypothetical ancestor of another language or group of languages. “Proto”是“protolanguage”這樣的詞的構詞成分，后者是指另一種語言或另一組語言的假設祖先。

of or relating to the relationship between or among languages that are descendants of a protolanguage 語言史的，屬于、關于一個原始母語各分支之間關系的