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Old English lēaþor (inherited)
←
Old English lēaþor (derived)
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Middle English lather (inherited)
←
Proto-Germanic *lauþrą (inherited)
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Ancient Greek λούω (cognate)
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Proto-Indo-European *lewh₃- (mention)
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Proto-Indo-European *lowh₃- (mention)
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Icelandic löður (cognate)
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Ancient Greek λούω (cognate)
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Norwegian Bokmål skum (link)