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Proto-Celtic *leg- (cognate)
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Middle English loogh (link)
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Middle English lough (link)
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Proto-Germanic *lōgą (inherited)
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Old High German luog (cognate)
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Proto-Indo-European *legʰ- (derived)
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Old Norse lóg (cognate)
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Old Frisian lōch (cognate)
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Old Irish lige (cognate)