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Definition of Splint bone
1. Noun. A rudimentary metacarpal or metatarsal bone on either side of the cannon bone in the leg of a horse or related animal.
Medical Definition of Splint bone
1. The second or fourth, or internal or external small metacarpal bone's in the horse; these are splinter-like in shape and lie on either side of the metacarpal or cannon bone. Synonym: fibula. (05 Mar 2000)