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The Collaborative International Dictionary
byrlaw

Birlaw \Bir"law\, n. [See By -law.] (Law) A law made by husbandmen respecting rural affairs; a rustic or local law or by-law. [Written also byrlaw, birlie, birley.]

Wiktionary
byrlaw

n. ''(obsolete except in historical references)'' the local customs and laws of a settlement or district