A horse with all its natural powers; an uncastrated stallion (archaic veterinary term).
From French entier, meaning 'whole' or 'entire,' from Latin integer, 'untouched' or 'whole.' The term preserves the French horse-breeding vocabulary in English.
This is from the vocabulary of horse-breeders and veterinarians—a specialized jargon that reveals how intimate knowledge creates its own language. Breeding terms are often the oldest in any language about animals.
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