In farriers' terminology, the part of a horse's hoof between the frog and the wall, or a disease affecting this area.
From Middle English 'frush' or 'froush,' possibly derived from Old French 'froisser' (to break or crush). This is specialized vocabulary in horseshoe making and veterinary work.
Blacksmiths and farriers developed incredibly precise language for horse anatomy because their livelihoods depended on understanding every part of the hoof—'frush' is part of a rich technical vocabulary most people never encounter!
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