Definition of "quarter-crack" []

• In veterinary surgery, a fissure or crack in that portion of the wall of a horse's hoof between the toe and the heel which is known as the quarter. (noun)

The Century Dictionary (Public Domain)

• "The margins of a quarter-crack and the wall just posterior and below it should be cut away until quite thin."
• "Any injury to the coronary cushion that secretes the fibres of the horny wall may result in either toe - or quarter-crack."
• "It may involve the wall of the _toe_ (toe-crack) (Fig. 41) or _quarter_ (quarter-crack) (Fig. 42)."