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Old English bitter (inherited)
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Old English biter (mention)
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Middle English bitter (inherited)
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Middle English bittre (mention)
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West Frisian bitter (cognate)
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Proto-Germanic *bitraz (inherited)
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Proto-West Germanic *bit(t)r (inherited)
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Proto-Indo-European *bʰeyd- (root)
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Icelandic bitur (cognate)
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Saterland Frisian bitter (cognate)
→
Lower Sorbian górki (link)
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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)
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Sranan Tongo bita (derived)
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Sranan Tongo bita (link)