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Definition of Jakob Ludwig Karl Grimm
1. Noun. The older of the two Grimm brothers remembered best for their fairy stories; also author of Grimm's law describing consonant changes in Germanic languages (1785-1863). 
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1. Noun. The older of the two Grimm brothers remembered best for their fairy stories; also author of Grimm's law describing consonant changes in Germanic languages (1785-1863).