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Middle Dutch bitter (inherited)
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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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Old Dutch bitter (inherited)
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Old English biter (cognate)
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Catalan bíter (borrowed)
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Luxembourgish batter (cognate)
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Sranan Tongo bita (borrowed)