grease heel
noun
: a chronic inflammation of the skin of the fetlocks and pasterns of horses marked by an excess of oily secretion, ulcerations, and in severe cases general swelling of the legs, nodular excrescences, and a foul-smelling discharge and usually affecting horses with thick coarse legs kept or worked under unsanitary conditions
called also greasy heel
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Merriam-Webster unabridged
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