The origins of the Anglo-Arabian or Anglo-Arab horse breed. The progeny of a paring of an Arabian pureblooded mare with the English thoroughbred or vice versa, was by the Frenchmen called/named the Anglo-Arabian fullblood/pureblood. The products of other pairing of the Anglican and the Arabian were/are called Anglo-Arabian halfbloods; hence only one parent was a fullblood/purebred.