sidebone

noun
side·​bone | \ -ˌbōn How to pronounce sidebone (audio) \

Medical Definition of sidebone

1 or sidebones  plural in form but singular in construction : abnormal ossification of the cartilages in the lateral posterior part of a horse's hoof (as of a forefoot) often causing lameness
2 : one of the bony structures characteristic of sidebone

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