A Corn

1. A type of callus, usually on the feet or hands. Synonym: clavus Corn (pathology) - Wikipedia
2. (veterinary medicine, pathology, equestrianism) (countable) inflammatory disease of horse hoof, at the caudal part of the sole.
3. (veterinary medicine, pathology, cattle) (countable) skin hyperplasia with underlying fibroma between both digits of cattle.