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Definitions of thurl:
noun: (agriculture, chiefly in the plural) Either of the rear hip joints where the hip connects to the upper leg in certain animals, particularly cattle; often used as a reference point for measurement.
verb: Alternative form of thirl [(transitive, possibly obsolete) To pierce; to perforate, penetrate, cut through.]
noun: Alternative form of thirl [(archaic or dialectal) A hole, an aperture, especially a nostril.]