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Chronic disorder involving the tarsus (i.e., hock) of the horse.
See also: bog spavin, bone spavin, blood spavin.
Synonym(s): jack spavin, jack


1. male donkey; called a stallion in Great Britain.
2. see track leg.

jack colt
male donkey less than 3 years of age.
mule jack
one bred to mares for the production of mules.
References in classic literature ?
But let me reassure you, Jack, as to the chances of its overcoming me.
the Quadling Country is full of dangers," declared Jack.
It was a two days journey from Jack Pumkinhead's house to the edge of the Quadling Country, for neither Dorothy nor Ojo could walk very fast and they often stopped by the wayside to rest.
This evening he was particularly careful not to neglect his duty, for he had just come from a conference with the boy's father and mother in which it had been impressed upon him that he must exercise the greatest care to prevent Jack visiting the music hall where Ajax was being shown.
Kneeling upon him, Jack tore strips from a sheet and bound the man's hands behind his back.
In the meantime Jack was enjoying to the full the stolen pleasures of the music hall.
The Jack at the Ship was instructed where the drowned man had gone down, and undertook to search for the body in the places where it was likeliest to come ashore.
Inside, in so wildly struggling a tangle on the floor that it was difficult to discern what animals composed it, were Alphonso, Jack, and Michael looked together.
Alphonso flung back on Jack, a sorry antagonist by this time, who could only pant and quiver where he lay in the welter of what was left of him.
Like many fairy tales, it is about a boy named Jack who lives on a small farm.
I knew this when I looked at the Labour graphics on the telecasts, and there, right in the middle, was a Union Jack.
Since the 1930s, Power Jacks or its forbears have pioneered screw jack technology to help companies in a variety of industries with their manufacturing processes.