from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. pupillary athetosis; spasmodic dilation and contraction of the pupil between the sphincter and dilator muscles.

from The Century Dictionary and Cyclopedia

  • n. In pathology, an affection of the eyes; clonic spasm of the iris.


from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek, horse, perhaps due to the rhythm of the contractions representing a galloping horse.


  • I did not find a single word in our language closer to this meaning than hippus, even though the Arabic word, unlike the Hebrew hippus, implies not only the examination of a notion but knowledge of the notion examined.

    Samuel Ibn Tibbon

  • Wide-open blue eyes with broad pupils, in which I could plainly see the characteristic "hippus" -- that incessant change of size that marks the unstable nervous equilibrium -- parted lips, and wandering taper fingers, were as the stigmata of his disorder.

    John Thorndyke's Cases related by Christopher Jervis and edited by R. Austin Freeman

  • The translation itself, however, uses terms such as hippus that Ibn Tibbon, according to his own testimony (see below), only coined much later, after 1213. 4.

    Samuel Ibn Tibbon

  • I say: it seems to me that the philosophers borrowed the Arabic word, which I replace with the Hebrew hippus, from the language of the multitude, who use it to express a notion that resembles what the philosophers intend when they use it.

    Samuel Ibn Tibbon

  • Indeed, he has not yet even been named, although we are quite familiar with his attributes; perhaps when his bones are ultimately found-and they will be-a proper name would be -paleohippus, " the hippus of the Paleocene epoch.



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