protolanguage

[ proh-toh-lang-gwij ]
/ ˈproʊ toʊˌlæŋ gwɪdʒ /

noun Linguistics.

the reconstructed or postulated parent form of a language or a group of related languages.

Origin of protolanguage

First recorded in 1945–50; proto- + language
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British Dictionary definitions for protolanguage

protolanguage

/ (ˌprəʊtəʊˈlæŋɡwɪdʒ) /

noun

an extinct and unrecorded language reconstructed by comparison of its recorded or living descendantsAlso called: Ursprache
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012