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1. A short, sharp-pointed, large-headed nail, used in shoeing houses and for studding the soles of heavy shoes.

2. A clownish person; a rustic.

(Science: medicine) hobnail liver, a disease in which the liver is shrunken, hard, and covered with projections like hobnails; one of the forms of cirrhosis of the liver.

Origin: 1st hob _ nail.