Karl Friedrich Christian Brugmann ( BROOG-mən; né Brugman; 16 March 1849 – 29 June 1919) was a German linguist and one of the founders of the Neogrammarian school. He is best known for his contributions to Indo-European linguistics, particularly in the fields of historical phonology and morphology. Brugmann contributed to the formulation of the Neogrammarian principle of the regularity of sound change and was a principal author of the Grundriss der vergleichenden Grammatik der indogermanischen Sprachen, a reference work in comparative Indo-European grammar.
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