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.