Grundriß der vergleichenden Grammatik der indogermanischen Sprachen (German for 'Outline of the comparative grammar of the Indo-Germanic languages') is a major work of historical linguistics by Karl Brugmann and Berthold Delbrück, published in two editions between 1886 and 1916.
The grammar of Proto-Indo-European (PIE) is reconstructed from those of its daughter languages known in the late 19th century.
The work represents a major step in Indo-European studies, after Franz Bopp's Comparative Grammar of 1833 and August Schleicher's Compendium of 1871.
Brugmann's neogrammarian re-evaluation of PIE resulted in a view that in its essence continued to be valid until present times.
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