Definition of byrlaw
: the local custom or law of a vill, township, or rural district in the north of England or in Scotland that governs disputes relating especially to boundaries, dates of plowing, and use of common land; also : a particular custom or law established by common consent of the landholders of such a district
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Origin and Etymology of byrlaw
Middle English birelage, birlawe, perhaps from (assumed) Old Norse bȳjar lög, from Old Norse bȳjar (genitive of bȳr town) + lög law
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