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Proto-Germanic *bitraz (inherited)
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Middle High German bitter (inherited)
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Middle High German pitter (mention)
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Proto-West Germanic *bit(t)r (inherited)
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Old High German bittar (inherited)
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Proto-Indo-European *bʰeyd- (root)
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Icelandic bitur (cognate)
→
Old English biter (cognate)
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Luxembourgish batter (cognate)
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Old Norse bitr (mention)
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Serbo-Croatian biter (derived)
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Serbo-Croatian битер (derived)