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Grimm's Law A law discovered by Jacob L. Grimm, the German philologist, to show how the mute
consonants interehange as corresponding words occur in different branches of the Aryan family of
languages. Thus, what is p in Greek, Latin, or Sanskrit becomes f in Gothic, and b or f in the Old High
German; what is t in Greek, Latin, or Sanskrit becomes th in Gothic, and d in Old High German; etc.
Thus changing p into f, and t into th, "pater" becomes "father."