Zool. [According to Pallas, Zoogr. Rosso-Asiatica, 1831, called Tarpàn by the Kirghiz Tatars. (So F. tarpan, Littré, 1874.)] The wild horse of Tartary: see quots.
1841. C. Hamilton Smith, Nat. Hist. Horses, 160. The Tahtar or even the Cossack nations assert that they can distinguish a feral breed from the wild by many tokens; and denominate the real wild horse Tarpan and Tarpani. Ibid., 163. Real Tarpans are not larger than ordinary mules, their colour invariably tan, Isabella, or mouse. Ibid., 164. There is always a certain number of expelled Tarpan stallions among them [feral herds].
1905. W. Ridgeway, Origin of Thoroughbred Horse, 34. It would appear that Prejvalskys horse is nothing more than the Tarpan of the older writers.
1910. Dr. P. Chalmers Mitchell, Lett. to Editor. I think it is clear that the name Tarpan belongs to a genuine wild horse, a true species, but that it has been subsequently applied to the progeny of escaped domestic horses.