Grimm n 1: the younger of the two Grimm brothers remembered best for their fairy stories (1786-1859) [syn: {Grimm}, {Wilhelm Grimm}, {Wilhelm Karl Grimm}] 2: 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) [syn: {Grimm}, {Jakob Grimm}, {Jakob Ludwig Karl Grimm}]