| sidebone | <veterinary> A morbid growth or deposit of bony matter and at the sides of the coronet and coffin bone of a horse. Source: Websters Dictionary (01 Mar 1998) |
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| sidebones | Ossification of the lateral cartilages of the horse's foot, seen most often in the forefeet of the heavier working breeds; exostoses often appear, and may be seen and palpated above the hoof line. (05 Mar 2000) |