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Wikipedia definition
1. Coffin boneThe coffin bone, also known as the pedal bone (U.S. ), is the bottommost bone in the equine leg and is encased by the hoof capsule. Also known as the distal phalanx, third phalanx, or "P3". The coffin bone meets the short pastern bone or second phalanx at the coffin joint. The coffin bone is connected to the inner wall of the horse hoof by a structure called the laminar layer.
Read “Coffin bone” on English Wikipedia
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Read “Coffin bone” on DBpedia

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