“Protolanguage” in Japanese
Short answer
Protolanguage in Japanese is “祖語” (sogo). Full meaning: protolanguage, parent language.
Other ways to say “Protolanguage” in Japanese
基語
kigo protolanguage, parent language; root word, word in the parent language
共通基語
kyoutsuukigo protolanguage
母語
bogo mother tongue, native language; protolanguage, parent language
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